Question DOS Emulation performance on Ryzen 7800X3D vs 9800X3D

Dave3000

Golden Member
Jan 10, 2011
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My secondary PC has a Ryzen 7 7800X3D and my primary PC has a Ryzen 7 9800X3D. In DOSBox Staging, I noticed a benchmark that there is a huge difference between the 2 CPUs and I'm wondering if this is huge difference is normal or if something is not operating correctly on my 7800X3D that is causing it to be way slower in this benchmark than the 9800X3D. The benchmark is Chris's 3D Bench SVGA from the DOSBench pack. On the 9800X3D I get around 760 points and in the 7800X3D I get around 520 points in this one. The other benchmarks from this pack don't have this much difference between these two systems. Both systems have the same motherboard and RAM except the RAM is running at 5200 on the 7800X3D system and 5600 on the 9800X3D system as I left the RAM settings at their defaults. The 9800X3D system has an RTX 4090 and the 7800X3D system is using the IGPU. Also it's not because the 9800X3D has a RTX 4090, as the 7800X3D system scored the same in this benchmark even when I had the RTX 4090 installed in it, and I understand that because DOS emulation is purely CPU bound. Is it normal for the huge difference in this particular benchmark? Also in the Quake 640x480 benchmark from this pack, my 7800X3D system gets around 152 fps and my 9800X3D system gets around 190 fps, which seems more like the difference I would expect between the two CPUs.
 
Last edited:
Jul 27, 2020
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Are both systems running the exact same Windows builds? You can check by running winver in Start->Run or just typing it and clicking it in the Start menu.

Please provide the following benchmarks on both systems:

MaxxMem2: http://maxxpi2.de/pages/downloads/maxxmemsup2---download.php

Geekbench score URLs for both systems (for comparison).

The benchmarks in my sig (rudi_float normal and AVX-512 and the RAM latency one).

Maybe there's something interesting to be gleaned from the scores.
 

Dave3000

Golden Member
Jan 10, 2011
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They are using the same Windows builds but one the 7800X3D system is the Pro version and the 9800X3D system is the Home version.
 
Jul 27, 2020
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One idea is to set the 7800X3D at the same RAM speed/timings as the 9800X3D system, just long enough to benchmark it in the Chris bench and see how much perf improves.
 

Dave3000

Golden Member
Jan 10, 2011
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108
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I just did that and no improvement in Chris's 3D Bench on the 7800X3D system. I think that that benchmark fits into the L3 cache memory of the Ryzen even non-X3D, since this benchmark was released in the mid 90's, 16GB RAM at the time was considered on the higher end, and that's why I think faster RAM didn't make a difference in this benchmark, because it all fits inside the L3 cache.
 
Last edited:
Jul 27, 2020
24,671
17,142
146
One more idea. Disable AVX-512 in the BIOS on both systems and see how the score changes. Is the gap still the same or it is reduced?
 

Dave3000

Golden Member
Jan 10, 2011
1,493
108
106
I just tried that and it didn't change the gap between these two systems in this benchmark.
 
Jul 27, 2020
24,671
17,142
146
Possibly some DOS Staging optimization that really prefers the Zen 5 architecture or extra frequency I guess. You could try different versions to see if DOS Staging has always liked Zen 5 or if it's a recent optimization.
 

Dave3000

Golden Member
Jan 10, 2011
1,493
108
106
Well, I just tried regular DOSBox and get 330 points on the 7800X3D system and 410 points on the 9800X3D system in Chris's 3D SVGA Bench. The variance is not as huge in this one.
 
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