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Old 05-30-04, 05:03 PM   #53
jimmor
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Default Re: Basic FX59xxx bios changes

Quote:
Originally Posted by Fahim
Jimmor,

i have some questions.

01. Can I flash my MSI FX 5900XT with 5900U/5950U BIOS. I heard that flashing with 5900/5950 bios causes temperature drop. Is it true??
No, I don't believe a 5950u bios will do much for your card ! If however you want to try just for the hell of it, try using one of my underclocked 5950u bios's available either from Mavke wesite or Dr.Infern0 post at Guru3d forum ? You could also try any 5900u bios as your card runs fine at the stock 450/850 of that card, But I also don't think you will get much improvement with your MSI5900XT card ? But of course, you could prove me wrong ? Unfortunately I personally cant say with any authority if a 5900u or 5950u bios can work well with XT cards as I don't have one ? Most of my knowledge in this area is based on feedback I have had from others !

for temps; flashing with a 5900u bios wont help with any temp issues. However, because of a number of parameter changes, flashing with a 5950u bios can improve temp control ! But unfortunately because of the slow memory on your card and low core volts, you would be unlikely to overclock high enough to achieve any real performance benefits ! But if all you want is better/cooler operation then a 5950u bios may be your answer ? Using either a ASUS 5900u or 5950u bios will help with core cooling as both run the fan full speed all the time ? Mind you they also run 3D all the time as well !

Quote:
02. My 9800P memory (Samsung GC2A, probably 2.8ns) runs at stock (680MHz) is hotter than FX memory (Hynix 2.5ns) @ 850MHz. So, should I feel safe about FX memory (No ramsink)?
I think I have replied to this before; What concerned me before was that you had no ramsinks and no means of measuring actual memory temp ? Your memory chips will likely run fine at 850MHz, but will, as you have found, run very hot ? And will get even hotter as your case and/or environment also gets warmer ? In this situation I would, barring my ability to fit ramsinks, run my memory lower ? However I would probably make a judgement based on temps at 800, 810, 820, 830, 840 ? Temp issue my be exponential rather than linear, so maybe a small reduction in speed may give a large reduction in temp ? test and see ?


Quote:
03. By changing latency from 43/03 to 40 means higher CAS or lower CAS?? Maybe higher as it causes higher overclocking.
the "03" is very low CAS if you want to call it that ! And "40" is lower than "43". But it doesn't quite work that way in your bios ! And it depends whether we are talking about a XT type or higher card.

There are many timing parameters in a bios, however at the moment we are only suggesting the change to one area ! The "03" value is standard for the slow memory of a XT. And was chosen to improve performance at lower memory clocking speeds ! However, I believe, if anyone is foolish enough to try, that the "03" value could lockup a card using a 5900nu, 5900u or 5950u bios ? I would certainly never recommend it !

For your XT card and bios, you could try many diff values ranging from "03" to "43" ? Somewhere between these is probably a "sweet spot" for your card, which will give the best possible memory performance ? And depending on what "ns" rating of memory, will depend on where the sweet spot is ? Having said all this, it may also be that many of the intermediate values cause artifacts or worse simply because of other interactive timings in the bios ? All my trials were with my 5900nu card and I know there was little latitude with changes before problems occurred ?

Quote:
04. Is it too risky to remove the heatspreader from core?? FX is now running @ 450/850. It is rock stable @ 485MHz also. I don't want to overclock more but I think without heatspreader, FX will run cooler.
I presume by heatspreader you mean the little cap over the core and not the core heatsinking ?

I do believe some people have removed the heatspreader to make better contact with the GPU, but it is risky ? Since I've never done it myself, I don't have details of the actual risk/damage likely from trying ? But also remember the heatspreader is primarily there to protect the GPU die from undue pressure, knocks, bumps or force, so you would have to be extremely careful if you did decide to remove it ?
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