Thanks TONY - drive strength helps coldbug

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Originally Posted by Tony

Now, we all know VTT and Vref =VDD/2, isssue is how many boards can hold this exactly true under load? EMC2 showed us that the Ultra D had vtt issues and i showed with a simple mod to the board you could set VTT hot and gain a few FSB and lower vdimm.

finally I can't say much more on resistances, some secrets have to remain secret for a while at least....sorry.

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Tony,
have you tried the VTT mod on the Expert too?

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Originally Posted by Tony

finally I can't say much more on resistances, some secrets have to remain secret for a while at least....sorry.

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KK

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Originally Posted by MaxxxRacer

Tony, I think that there is something that mighth help the phase guys, with their inability to get into the bios to change the drive strength when it gets cold ;)

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any updates?

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Originally Posted by bachus_anonym

If single stage guys are having serious cold-bug issues at HTT lower than 250-270 then this must be some sort of severe case of cold bug. Normally, cold bug affects CPUs at high HTT, around 300 is a good guess. That's why higher multi may often be a saver.

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Opty 146 CACJE 0546. Did not boot at -10C, that's how severe it gets. Now how to work round that? The last one I had, I tried staging the boot and phase power up.... resulting in one dead CPU. Now I have another 146 from the same batch, same performance on air as the last and, I'm betting, same degree of cold bug. So I'm interested in finding a way of making it boot safely and not trashing it. Perhaps the Vapo LS controller will let me try booting at +5C or more; it means that any reboots will take a 30 minute break to warm up.

Any ideas?

Even if you can tweek the system to boot early you will still have problems when the vapo gets to operating temps.

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Originally Posted by bachus_anonym

(...) My 3700+ will always freeze (even with multi-tweak) above 330HTT and it's useless on DI. Opteron I have here (naked, -24C in BIOS) is much better. It's good for some serious HTT speeds (>380HTT) but only with multi-tweak running.(...)

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multi-tweak? :confused:

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Originally Posted by deff_ins

multi-tweak? :confused:

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multiprocessor tweak

So if I am running 2 x 1GB I should be running 9-15 on the expert under phase?

sorry, can anyone give me some hints on the multprocessor tweak and how to enable it, and any advice on drive strength levels for the Ultra-D

Thanks a million :)

Kenny

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Originally Posted by K404

sorry, can anyone give me some hints on the multprocessor tweak and how to enable it, and any advice on drive strength levels for the Ultra-D

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RMB on My Computer > Manage > Device Manager > Computer, I believe.

Yup, sorry I got it just after I posted. God bless google :)

Cheers!

Kenny

Good info. :toast:

just wanna let everyone knows

9-15 for 4 dimm
1-8 for 2dimm

according to Oskar Wu in Nov. 12, 2005

here in Latvia was very cold some last days. about -25C. so we used cold air to chill down vapochill ls to emulate DI :D lovest temp on vapo lcd was -69, in bios @3.2ghz -35, in windows -33.
so - this time we tested on expert board. most intresting thing is that @-33C - and no coldbug. on sli-d with same conditions coldbug was at -27C :confused:

full test setup:
dfi expert (no coldbug @-33C windows working fine - no OS freezeng)
dfi sli-d (coldbug @-27 windows freezing, windows bootup imposible)
opteron 170 @3.2Ghz 1.62v 3d benchable
mushkin redline hp3200 (drive strenghts: 8/3 on sli-d | 7/4 on expert)
antec tp2 550w
vapochill ls

i have tested diffrenet drive strenghts combinations on sli-d - no change...
so - tell me why on expert cpu has no coldbug @-33 but on sli-d it has?

P.S. sh** my english is lame :(

i read all that thread, im using sli -dr , 2x256mb bh5 what drive strengt then i need to use... ? i hate that damn coldbug :|

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Originally Posted by s7e9h3n

Ok...here's the Cliff's Notes for Drive Strength and Data Strength:

Drive strength is numbered in ascending order meaning that 1 will be the least taxing on a memory controller. Depending on which board you're using, the highest Driving Strength possible is 8 or 15. Generally, unless you're running 4 Dimms or 2GB Kits, a max driving strength of 8 is sufficient. The reasoning behind lowering drive strength to defeat the cold-bug is that the lower you set it, the less work the memory controller on the cpu has to do.....

Data strength, in short, deals with the % of errors allowable in certain calculations. Originally, Oskar had the setting of "4" available in the first bios for the ultra/sli/sli-dr. But now the highest available on those boards is "3". When you set a higher Data Strength, you're telling your cpu that accurate results are a MUST and therefore your cpu will have to work harder to acheive them. The higher the Data Strength, the better/faster the benchmark. But remember, it's not always ideal to set a high data strength for all cpu's as some can't handle the load. FX57's should usually be run with a drive strength of 8 and a data strength of 3 (or 4 in certain cases).

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hmm... i tried this settings - drive & data strength - but with my FX they wont work. My prob is that i cant get a high HTT, but if i´am using a higher multi i can run spi about 3,55Ghz. So what is limiting my HTT ? :confused:

thanks for some hints ;)


cu

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Originally Posted by Sauron_Vie

hmm... i tried this settings - drive & data strength - but with my FX they wont work. My prob is that i cant get a high HTT, but if i´am using a higher multi i can run spi about 3,55Ghz. So what is limiting my HTT ? :confused:

thanks for some hints ;)


cu

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Sounds like a cold-bug to me....what stepping 57? And @ what temps?

it´s a 0531RPMW and i have @idle about -25° and @load about -7° if i use Vcore about 1,65 to 1,67V.

i reached 3,55ghz with multi 15, but i cant go up with the HTT and lower the multi. if i do that, i get a freeze evertime. :mad:

Attachment 42696

cu

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Originally Posted by Sauron_Vie

it´s a 0531RPMW and i have @idle about -25° and @load about -7° if i use Vcore about 1,65 to 1,67V.

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Yup...cold-bug it is....CAB2E correct?

yep stephen, u r right. damn and ok, this baby will find the way to the marketplace and i have to take a look for a new one... lool :D

many thanks for the quick reply buddy ;)


cu

wow Tony! You amaze me :)
I love this forum :)
!!!!

ya.... its all about drive strength .. nice find :toast:

I've been playing around with settings on my bugged 170 and expert now. Want to know what they do? N-O-T-H-I-N-G. This is the biggest load of crap I've seen in a while. You name a combo I've tried it. This will not work.

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Originally Posted by afireinside

I've been playing around with settings on my bugged 170 and expert now. Want to know what they do? N-O-T-H-I-N-G. This is the biggest load of crap I've seen in a while. You name a combo I've tried it. This will not work.

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who said that this is the answer to all problems .....you should know better

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Originally Posted by afireinside

I've been playing around with settings on my bugged 170 and expert now. Want to know what they do? N-O-T-H-I-N-G. This is the biggest load of crap I've seen in a while. You name a combo I've tried it. This will not work.

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Well I never said it was a cure, some CPU's will see a gain some will not. fact is we are running CPU's at temperatures that they were not designed to run at and motherboards too for that fact,just because it does not work for you does not mean others will not see a gain.

All I can say is design of motherboards continues, companies are now factoring in that more are using subzero temps so will will see small gains with each design.

So these companies care about overclockers? seriously? I know that sounds sarcastic, but do we make enough of a difference to their sales?

Does AMD care about cold-bug, do you think?

K