Recent content by jasonpetras

  1. J

    Wiring diagrams needed to convert 12vdc to 5vdc and 3.3vdc effeciently

    Buy this: TI's PTH12020WAH (12V in, adjustable 5.5V to 1.8V out, 18 Amp) or PTH12030WAH (12V in, adjustable 5.5 to 1.8V out, 26 Amp). To see the variety of these power supplies, check out this link...
  2. J

    Agressive Memory Timings Comparison

    Thanks all for your input! Also, thanks Evan Lieb for the great article you just posted! J
  3. J

    Agressive Memory Timings Comparison

    Squid, that seems interesting that his faster mem gives him the advantage between the two cpus. Does he have a different video card or were you running different number of background? I understand your tests were probably very informal, but the results are interesting. Choco, have you tried...
  4. J

    Agressive Memory Timings Comparison

    so, your faster cpu with slower memory is *slower* than his slower cpu with faster memory... interesting data point... Thanks! Anyone else?
  5. J

    Agressive Memory Timings Comparison

    All, Has anyone found an article comparing the relative performance gain of more agressive memory timings? For example, compare Kingston's 2-2-2-5-1T with El Cheapo's 3-4-4-8-3T? If you work the numbers of 1GB of PC3200, the difference in price is around $70 to $80 more for the faster timed...
  6. J

    Wildcat VP760: any comparison vs. std vid cards?

    Helio, Yeah, the marketing machine definitely seems to be in play here. I did get the thing to work at "full speed" for a while last night. I changed the color depth to from 32 bits to 16 and back to 32 and all was happy.... until I rebooted the computer.... now all is in...
  7. J

    Wildcat VP760: any comparison vs. std vid cards?

    Viper, it looks like it is all gone
  8. J

    Wildcat VP760: any comparison vs. std vid cards?

    Helio, I just finished reading Tom's review on the board, and it does seem gravy for the 3D CAD guys, but I'm just a lowly EE. No 3D rendering for me. Boards are still done a layer at a time. Although I have not talked with Mentor about the rendering engine they use, I would be surprised if it...
  9. J

    Wildcat VP760: any comparison vs. std vid cards?

    Hey all, I needed to be able to use two monitors for what I do I work. So I asked my head IT person to hook me up. A little while later he came back, took out my GeForce2 and replaced it with a VP760. Now everything looks like he just replaced my computer with a 386. 2D performance is just...
  10. J

    why do ide drives only spin at 7200 rpm while scsi goes up to 15k?

    Two reasons: volume and market. With IDE drives, WD, Maxtor, et al, can sell a bazillion of them for a penny profit (I'm exadurating) and make lots of money and keep them in business. To further push down the cost, the fact that they will sell a bazillion means that the individual parts that...
  11. J

    OC3= 84 T1's???

    do a "sonet lecture" (try both quotes and no quotes) search in google. You will find a bunch o good stuff!
  12. J

    Circuit Madness

    I would recommend using an optocoupler (also called an optoisolator) for your "relay" action. They provide high voltage isolation (usually a thousand or two volts) and easy wiring to discrete logic (as used within the power supply. Check out Digikey.com for the optocoupler. They are a really...
  13. J

    GF4 MX 440 and Tyan GX based motherboard, help please!

    Its seems that this is a match made in hell and I am not sure why. I put the card in and the Tyan S2DGE lets me know (by beeps) that its not going to play with the Gainward GeForce 4 MX 440. Does anyone have an idea why? Thanks for you help! Jason
  14. J

    Would turning off one light bulb really save oil?

    Peter, Its very true what you say about f-nature for creature comforts. It is really true here in SF Bay Area. Every other person has a SUV (some have lifted Excursions) and they drive them at two speeds: 85 mph (no traffic, midnight to 4 am) and ~10 mph (traffic 4 am to midnight). We claim...
  15. J

    nForce2 with integrated graphic ?

    Ride, I ment that the L7VTM is not coming to these shores. As far as I know the K7S7AG is coming here. Its probably worth and email if the board is not listed on the front page of ECS's website. I wrote ECS about the L7VTM, so that's how I heard about its anti-us distribution. =-) J
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