Question 3700x vs 5700x

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jamesdsimone

Senior member
Dec 21, 2015
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If I decide to upgrade is the 5700x that much better than the 3700x? 3700x's are listed at less than 100USD on ebay. 5700x's are around 200USB. The CPU is going to be used for gaming and transcoding. Is there any reason to get a 12 core CPU?
 

jamesdsimone

Senior member
Dec 21, 2015
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Your board doesn't have bios flashback.

I have used a toothpick to nudge the pins back, then took a credit card I shaved the edge of, to make certain they are properly aligned. Never had a issue afterwards. If it doesn't drop in i.e. zero insertion force, keep at it until it does. Then flash the bios for the Zen 3 support.

The manual says it has a clear CMOS button that will reset BIOS to default values. I haven't looked at the actual board.
 

jamesdsimone

Senior member
Dec 21, 2015
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Microcenter prices as of 12-17-22. I don't see any reason to get a new 3700X. I could probably get one for less than 100USD on ebay but not sure I want to be bothered. So I'm thinking the best choice would be the 5800X. It's only 10 dollars more than the 5700X. 12 cores would be nice and would probably do great at transcodong but not sure it would be worth using the older architecture. Thoughts? I'll probably wait until after Christmas to see if prices change.

239.99 for a 3900X
199.99 for a 5800X
189.99 for a 5700X
159.99 for a 3700X
 
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DAPUNISHER

Super Moderator CPU Forum Mod and Elite Member
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The manual says it has a clear CMOS button that will reset BIOS to default values. I haven't looked at the actual board.
How bios flashback works, is you can put a USB drive with the new bios in the designated port, push a button, and it will flash it to the board. All without a CPU or ram installed, just the board and power supply.

I like my 5800X, I set it to ECO mode in the UEFI and add the +200MHz boost clock. It boosts past 5GHz and runs on 88W package power.

12 cores isn't needed for gaming, though some games can use them. I'd go 5800X in your situation. Down the road you could get a 5950x or 5800x 3D for a nice discount if you can use the extra performance or cores.
 
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jamesdsimone

Senior member
Dec 21, 2015
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How bios flashback works, is you can put a USB drive with the new bios in the designated port, push a button, and it will flash it to the board. All without a CPU or ram installed, just the board and power supply.

I like my 5800X, I set it to ECO mode in the UEFI and add the +200MHz boost clock. It boosts past 5GHz and runs on 88W package power.

12 cores isn't needed for gaming, though some games can use them. I'd go 5800X in your situation. Down the road you could get a 5950x or 5800x 3D for a nice discount if you can use the extra performance or cores.

Sorry I was confused. I'll figure out the flashing the BIOS. As long as I can reset to factory defaults I can't brick my MB. Tomorrow I'm going to see if I can get my 2700X to post. If so I'll get the system up and running and then decide when I want to grab a new CPU. I was just looking at Anandtech benchmarks and the 5800X is the clear winner. For some reason the 5700X isn't listed but the 5800X is only 10 dollars more. The 5800X beats the 3900X in pretty much every category that counts. I guess most things just don't take advantage of more than 8 cores.
 

Thunder 57

Diamond Member
Aug 19, 2007
3,493
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Sorry I was confused. I'll figure out the flashing the BIOS. As long as I can reset to factory defaults I can't brick my MB.

Sure you can. Flash the wrong BIOS, have a power outage while flashing. I've never heard of a board without a CMOS reset. BIOS flashback is different and a nice to have feature. If you have one then you truly can't brick your board, that I am aware of anyway. Plus you can update a BIOS to support a newer CPU without having a CPU that it currently supports.

If so I'll get the system up and running and then decide when I want to grab a new CPU. I was just looking at Anandtech benchmarks and the 5800X is the clear winner. For some reason the 5700X isn't listed but the 5800X is only 10 dollars more. The 5800X beats the 3900X in pretty much every category that counts. I guess most things just don't take advantage of more than 8 cores.

The 5700X/5800X are clear winners because they are that much better on a per core basis. Handbrake can easily use 12 cores with the right settings. The 8 core 5000 series CPU's are faster though and can more than compensate for having four less cores. From what I have seen the 5700X/5800X are about 0-10% faster in Handbrake than a 3900X.

There is no 5700X in Bench because Anandtech couldn't be bothered to run the numbers. Not surprising considering they haven't reviewed video cards in forever. It was only a matter of time before CPU's suffered as well, especially with Dr. Cutress gone.
 

Steltek

Diamond Member
Mar 29, 2001
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The manual says it has a clear CMOS button that will reset BIOS to default values. I haven't looked at the actual board.

Clearing the CMOS won't recover you from a bad flash - it resets the BIOS values to defaults, not the BIOS itself.

Honestly, unless you can get that CPU booting solidly, I'd pay Microcenter the $30 (I think that is what they charge to update a BIOS) to do it rather than trust a flaky CPU and trash the motherboard with a crash in the middle of flashing the BIOS.
 

jamesdsimone

Senior member
Dec 21, 2015
889
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Clearing the CMOS won't recover you from a bad flash - it resets the BIOS values to defaults, not the BIOS itself.

Honestly, unless you can get that CPU booting solidly, I'd pay Microcenter the $30 (I think that is what they charge to update a BIOS) to do it rather than trust a flaky CPU and trash the motherboard with a crash in the middle of flashing the BIOS.

I wouldn't flash the BIOS with my current CPU unless I got the system running stable with OS installed.
 

Steltek

Diamond Member
Mar 29, 2001
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jamesdsimone

Senior member
Dec 21, 2015
889
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There is a 3rd option as well, if you can't get the CPU stable and you don't want to pay Microcenter to do it.


AMD will loan you a low end CPU to use to flash the BIOS since you can't boot your AM4 motherboard without it. As far as I know, this program is still ongoing though you'd want to email AMD to be sure.

I worked on it today. I had apparently plugged my keyboard into the wrong USB port without noticing, one that probably needs drivers to work. So when I pressed Delete to get into BIOS it continued to boot from a hard drive with no GRUB on it. Switched to another port and got the 2700X to post and got into BIOS so it appears to be working ok. I'm going to have it dual boot Win7/Linux. I don't even have a video card yet so BIOS flash and CPU upgrade will be done after everything is up and running.
 

In2Photos

Platinum Member
Mar 21, 2007
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I worked on it today. I had apparently plugged my keyboard into the wrong USB port without noticing, one that probably needs drivers to work. So when I pressed Delete to get into BIOS it continued to boot from a hard drive with no GRUB on it. Switched to another port and got the 2700X to post and got into BIOS so it appears to be working ok. I'm going to have it dual boot Win7/Linux. I don't even have a video card yet so BIOS flash and CPU upgrade will be done after everything is up and running.
How did you get into the BIOS without a video card?
 
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Rigg

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May 6, 2020
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I question how much sense it makes to drop a $200+ Zen 3 CPU into one of these older motherboards given the I/O limitations. Especially when you currently have access to multiple incredible deals from Micro Center on a full platform upgrade.

Your primary GPU lanes are stuck at gen 3 x16 (or 8+8), your primary NVME slot is stuck at gen 3 x4, and your x470 chipset uplink is gen 3 x4. The M2_2 runs through the chipset and is limited to gen 2 x4. The remaining PCIE slots are also stuck on gen 2. While it's a decent motherboard, and was quite good when it was current, its vastly inferior to any x570 or even a b550 board in terms of PCIE bandwidth.

I'd sell the 2700x and x470 and get on a more modern platform. I'm an AM4 enthusiast. I have built a bunch of PC's on this platform. It's near and dear to my heart. It's time to move on from 300/400 series motherboards for all but low tier used budget builds. IMHO dropping $200+ CPU's in these boards is penny wise and pound foolish.
 

lopri

Elite Member
Jul 27, 2002
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I would go with 5800X given the choices. No reason to pick 3000 series chips with that price structure. 5800X performs similarly to 3900X in multi and beats it in single. It's got more clock headroom and better memory controller. It's a no brainer.
 

kschendel

Senior member
Aug 1, 2018
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I question how much sense it makes to drop a $200+ Zen 3 CPU into one of these older motherboards given the I/O limitations....

Your primary GPU lanes are stuck at gen 3 x16 (or 8+8), your primary NVME slot is stuck at gen 3 x4, and your x470 chipset uplink is gen 3 x4. The M2_2 runs through the chipset and is limited to gen 2 x4. The remaining PCIE slots are also stuck on gen 2. While it's a decent motherboard, and was quite good when it was current, its vastly inferior to any x570 or even a b550 board in terms of PCIE bandwidth.

This is all true, and I don't dispute that the B450's and X470's are limited. The question is does that actually matter, and there are a vast range of use cases where it doesn't - most gaming builds, for instance. PCIe 3 doesn't affect gaming GPU performance unless you are using one of the crippled AMD low-end units. Likewise for PCIe 3 vs 4 running NVMe SSD's. I would defy most users, including gamers, to subjectively tell the difference between PCIe 3.0 x2 and PCIe 4.0 x4, never mind PCIe 3.0 x2 vs x4. Put your most-used games on the x4 NVMe and use SATA for bulk storage.

There are absolutely use cases where all the above matters, but they are very very far from the majority, IMO. If I had a B450 or X470 motherboard, I wouldn't stress over whether I should keep it while upgrading the CPU.
 

jamesdsimone

Senior member
Dec 21, 2015
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This is all true, and I don't dispute that the B450's and X470's are limited. The question is does that actually matter, and there are a vast range of use cases where it doesn't - most gaming builds, for instance. PCIe 3 doesn't affect gaming GPU performance unless you are using one of the crippled AMD low-end units. Likewise for PCIe 3 vs 4 running NVMe SSD's. I would defy most users, including gamers, to subjectively tell the difference between PCIe 3.0 x2 and PCIe 4.0 x4, never mind PCIe 3.0 x2 vs x4. Put your most-used games on the x4 NVMe and use SATA for bulk storage.

There are absolutely use cases where all the above matters, but they are very very far from the majority, IMO. If I had a B450 or X470 motherboard, I wouldn't stress over whether I should keep it while upgrading the CPU.

I bought the board and CPU in April 2021 with the intention of upgrading my FX8350 that I used to transcode. I was going to pair it with a video card so I could use it to game as well. I haven't upgraded my gaming rig in years. The stupid video card prices hit and then I got involved with other things in life so I put the whole thing on the self. I just recently got back to it. The FX8350/ASUS Sabertooth is living out it's retirement as a storage server. I have everything finally put together and at this point just need to install the OS. A new MB would involve tearing everything down and rebuilding. I have no desire to do that so the limitations are more than acceptable. And I'm going from an FX8350/crossfired 7970's to 2700X>5800X/5700XT or 6600XT or maybe higher. Anything is going to seem insanely fast to me.
 

Rigg

Senior member
May 6, 2020
645
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This is all true, and I don't dispute that the B450's and X470's are limited. The question is does that actually matter, and there are a vast range of use cases where it doesn't - most gaming builds, for instance. PCIe 3 doesn't affect gaming GPU performance unless you are using one of the crippled AMD low-end units. Likewise for PCIe 3 vs 4 running NVMe SSD's. I would defy most users, including gamers, to subjectively tell the difference between PCIe 3.0 x2 and PCIe 4.0 x4, never mind PCIe 3.0 x2 vs x4. Put your most-used games on the x4 NVMe and use SATA for bulk storage.

In the here and now it's probably fine for most configs. You are correct that in a lot of scenarios it probably doesn't matter. I'd be a bit worried about how the bandwidth limitations are going to affect upcoming games that utilize direct storage though.

If I had a B450 or X470 motherboard, I wouldn't stress over whether I should keep it while upgrading the CPU.

What if you could walk into a Micro Center tomorrow and grab an Asus Z690 TUF and a 12700k for $360? What if you could walk into a Micro Center tomorrow and get a $50+ discount on an open box 500 series AM4 board and CPU combo? How about a $50+ discount on an open box 600 series AM5 board and CPU combo w/ a free 32GB DDR5 memory kit?

If i didn't have those kinds of bundle options than I probably wouldn't stress that much about sticking a $200+ Zen 3 in an old 400 series board either. It appears from an earlier post the OP does have those options though.
 

blckgrffn

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May 1, 2003
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I bought the board and CPU in April 2021 with the intention of upgrading my FX8350 that I used to transcode. I was going to pair it with a video card so I could use it to game as well. I haven't upgraded my gaming rig in years. The stupid video card prices hit and then I got involved with other things in life so I put the whole thing on the self. I just recently got back to it. The FX8350/ASUS Sabertooth is living out it's retirement as a storage server. I have everything finally put together and at this point just need to install the OS. A new MB would involve tearing everything down and rebuilding. I have no desire to do that so the limitations are more than acceptable. And I'm going from an FX8350/crossfired 7970's to 2700X>5800X/5700XT or 6600XT or maybe higher. Anything is going to seem insanely fast to me.

You’ve waited long enough! I vote 6700XT!
 

kschendel

Senior member
Aug 1, 2018
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...
What if you could walk into a Micro Center tomorrow and grab an Asus Z690 TUF and a 12700k for $360? ...

Well, that would be just fine. Too bad there's no Micro Center within hours of where I live. If OP has inexpensive bundle opportunities, then by all means consider them. I'm not sure I would pay a whole lot over the bare CPU price, though, because even at good bundle pricing there may not be much subjective return on the investment.
 
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Shmee

Memory & Storage, Graphics Cards Mod Elite Member
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^ That card is from a 3rd party Chinese seller. Hence the $45 shipping from Hong Kong.

I would get something from newegg or amazon directly, or check out the FS/T forums here.

Also, in one of your earlier posts, you mentioned a dual boot with Linux and Windows 7. I hope you don't plan on trying to use Windows 7, as the newer CPUs won't support it. Luckily you can upgrade to Windows 10 for free.

As for the CPU, if the 5800X is only $10 more, get that. Makes sense at current pricing. Though as mentioned, you may want to look out for a deal on a used 5900X.
 
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