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post #1661 of 2140
I did... but like I said, I'd take a bit hit.

I intend to do -bigadv eventually, and dropping the RAM that much would hurt more than an extra 100Mhz would give me.
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post #1662 of 2140
Have you tried working with the timings on the RAM yet?
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post #1663 of 2140
No... more concerned with the clock speed for now.
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post #1664 of 2140
Oh alrighty doe
You might have some success with that, even if you can't push the speed higher.

TL;DR don't give up on your RAM!
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post #1665 of 2140
Quote:
Originally Posted by zodac View Post
RAM... I tried 250*16 when going for 4Ghz, but for 3.9Ghz, I'd take a big hit with the RAM, so stayed with 200*19.5.

See... I'm learning stuff.
Quote:
Originally Posted by zodac View Post
No... more concerned with the clock speed for now.
whats the closest you can get to 1333 (preferably on the high side) at x19 or x18.5 or x18. surely you can get between 1333 and 1400 at 1:2 ram divider that your ram will overclock to (even if you have to loosen your timings a bit). the gain in folding performance from higher fsb, nb, and ram frequencies will be greater than the loss of performance from looser timings, imo.
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post #1666 of 2140
I've always heard that AMD prefers tighter timings over a similar gain in frequency, but I don't know if that applies to folding.
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post #1667 of 2140
Quote:
Originally Posted by juano View Post
I've always heard that AMD prefers tighter timings over a similar gain in frequency, but I don't know if that applies to folding.
I get better ppd at 9-9-9-24 ~1700 than I do with 7-8-7-24 ~1600 (stock timings and speed for my mushkin ram). This is just from personal experience though (and the higher ppd could be more a result of higher fsb/nb that comes along with higher ram speed- in either case, the higher the ppd the better )

I can say that these chips prefer a 1:3.33 ram ratio over 1:4. I can fold at a higher cpu clock (~4.21) with the fsb raised and the ram divider lowered to 1:3.33 than I can at 4.2 with the fsb at 200 and ram at 1600 with a 1:4 ratio.
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post #1668 of 2140
Quote:
Originally Posted by eloverton2 View Post
I get better ppd at 9-9-9-24 ~1700 than I do with 7-8-7-24 ~1600 (stock timings and speed for my mushkin ram). This is just from personal experience though (and the higher ppd could be more a result of higher fsb/nb that comes along with higher ram speed- in either case, the higher the ppd the better ):
How much better is the PPD??
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post #1669 of 2140
Quote:
Originally Posted by zodac View Post
CPU: 3.9Ghz (19.5*200) - 1.4875v in BIOS, CPU-Z jumps between 1.524-1.536v though.
NB: 2600Mhz - 1.3v
RAM: Stock (1333Mhz), 1.485v
HT:2000Mhz - Not sure on voltage; haven't touched it.
I know every chip is different and there are other factors to consider here, but did you try starting with 1.4v in BIOS and up it step by step to reach stability? 1.4875 just seems way high in BIOS, because your LLC profile is pushing that to 1.5+ which isn't good for temps or your CPU. Or you could try just lowering your LLC profile. Also mine was waaay more stable using higher FSB and a lower multiplier (250x16 rather than 200x20).

Same goes for your CPU-NB, 1.3v should be good for 3000Mhz, so you could try lowering that to 1.2ish if you want to stay with 2600Mhz which will also lower your temps. I did see a big performance gain when I went from 2600Mhz to 3000Mhz @ 4GHZ, however for stability you are right on point as Northbridge Frequency (+/-200) = (CPU-Frequency * 2 ) / 3.15 which puts 4GHZ @ 2539.683Mhz sweet spot.

RAM voltage should be whatever it's rated for give or take a point.

HT Link should stay at 2000Mhz, however shouldn't see a performance decrease up to 2350MHz on the HT Link if you have to choose it, but anything higher than 2000MHz is recommend you increase the HT Link Voltage. And keep in mind that there is nothing actually gained by overclocking the HT Link - it's merely a pipeline (albeit a pipeline used to carry data for just about everything on the board). Also make sure "HT link is equal to or greater than the speed of the memory".
Edited by ALUCARDVPR - 7/14/11 at 2:38am
post #1670 of 2140
Quote:
Originally Posted by ALUCARDVPR View Post
I know every chip is different and there are other factors to consider here, but did you try starting with 1.4v in BIOS and up it step by step to reach stability? 1.4875 just seems way high in BIOS, because your LLC profile is pushing that to 1.5+ which isn't good for temps or your CPU. Or you could try just lowering your LLC profile. Also mine was waaay more stable using higher FSB and a lower multiplier (250x16 rather than 200x20).
Yeah, for 3.9Ghz, I couldn't use a lower voltage without the FahCore crashing. And for 4Ghz, no voltage would make it stable and keep temps below 62°C, for 200*20, or 250*16.

I'm down to 3.8Ghz now, so I'll try bring the voltage down a bit more and see if I can change things.

Also, in what way should I change the LLC profile? I've not messed with that yet.

Quote:
Originally Posted by ALUCARDVPR View Post
Same goes for your CPU-NB, 1.3v should be good for 3000Mhz, so you could try lowering that to 1.2ish if you want to stay with 2600Mhz which will also lower your temps. I did see a big performance gain when I went from 2600Mhz to 3000Mhz @ 4GHZ, however for stability you are right on point as Northbridge Frequency (+/-200) = (CPU-Frequency * 2 ) / 3.15 which puts 4GHZ @ 2539.683Mhz sweet spot.

From what Blitz said, since my RAM runs at 1333Mhz, 2600Mhz would be fine. I'll mess around with the voltages though to see if I can lower it.
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