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EPoX MotherBoards EPoX Intel and AMD Motherboards.


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Old 18th August, 2004, 08:57 AM
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Over clocking ram 8rda+! 2x 256 corsair xms 3500 with heat sink. need help

Ok you guys.. i got 2x 256 of corsair xms 3500 ram. ive had it for a while.. i just dont have a clue of how far i can push it and still have it run 3dmark03. these sticks were 129 bucks a piece about a year ago, just for refrence.

I need to know the RAS, RCD, RP and CAS latency of how far i can push it on a 8rda+ board.

Basicly i want to get this computer running as fast as i possibly can.. run it to the limits.. i got the stock heat sink on it. and run 175x by 6.5 on this 2600 amd.

pls help
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Old 18th August, 2004, 12:39 PM
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Only way is to try

You're running at 6.5x175? 1137mhz? Hmm.

Not knowing any better my self, I would work your way down some of the more "standard" timings, adding voltage as necessary:

2.5-4-4-9
2.5-3-3-8
2-4-4-8
2-3-3-7
2-2-2-6

If I actually knew how the timings worked together, I'd be of more help. Is 2-4-4-8 faster than 2.5-3-3-8? I don't know.

According to Mushkin, the minimum value for tRAS (the last one) is CAS + tRCD + 2. However, I believe the NF2 chipset likes relatively higher values - I see a lot of people like 2-2-2-11.

I've never done this in a scientific fashion, but ideally, you would vary each parameter, test for stability, and benchmark. This would create a 5-dimensional graph!

You can use Prime95 as a quick and dirty test for stability, (use Sisoft Sandra with buffering disabled, for benchmarking) but I would certainly run memtest86 for a few loops as the ultimate test.
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Old 20th August, 2004, 12:49 PM
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Assuming you got good ram and board, you should be able to do 220-221, 2-2-2-5 @ max 2.86 VDIMM, DC, CPC enabled. I know I can do that with 2x512 MB XMS3500 on two Rev. 1.1 unmodded boards, and it's easier with 256 MB sticks. My boards are made first six months of 2003 and have the Crush3D chipset (or whatever they call it) to guarantee 200+ fsb operation.
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Old 20th August, 2004, 08:03 PM
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Quote:
Originally Posted by jnansley
Only way is to try
According to Mushkin, the minimum value for tRAS (the last one) is CAS + tRCD + 2. However, I believe the NF2 chipset likes relatively higher values - I see a lot of people like 2-2-2-11.
Actually, the minimum time for Tras is the greater of Trp + Trcd +Tcas + 2 (fudge factor) or the cycle time of the RAM. The cycle time of the RAM is never spec'd as a paramter for DIMMs, but IMO it should be. Most of the RAMs in current use cycle at around 55 nS, and I think this is why NF2 chipsets like a value of 11 for Tras. I suspect that the NF2 chipsets are spec'ing the Tras directly in terms of clocks. Since a 200 MHz clock has a 5 nS cycle time, 5 * 11 = 55nS, which is the cycle time of the RAM. I suspect that other chipsets like Intel and Via have a built-in hard limit of 5 or 6 clocks on Tras, so that anything you specify for the value of Tras in the BIOS is actually added to that. Not that this theory implies that, at much above about 225 MHz, you'll probably find yourself needing to bump that 11 to a 12 on the NForce chipsets. Note also that, if my assumption is correct, there is no way you will EVER get the NF2 chipset above about 275 MHz, because Tras has a maximum setting of 15. As a practical matter, other limitations kick in well before then.
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Old 23rd August, 2004, 09:16 AM
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ok gizmo... pls speak english... what can i do to get this system to run as fast as it can and still be rock solid... im at 180 by 6.5 right now and stock everything else except vid which is 301 by 330
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Old 23rd August, 2004, 12:18 PM
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He was talking english!
tRP, tRCD and tCAS are the correct timing names for RP, RCD and CAS respectively. Adding them together and throwing in a two should give you the correct figure for tRAS. If you adjust any of the three timing parameters, then you should also recalculate tRAS to keep the memory controller running optimally.

Increasing tRCD and tRP may help once you get above the highest operating frequency of the RAM. This effectively slows down how fast the RAM can throw data out, but allows you to continue increasing the clock frequency. tCAS doesn't usually make a huge impact on timings, as it is only required when moving from column to column, rather than when doing linear memory reads. Benchmarks tend to concentrate on linear reads, so the tCAS setting tends to make very little difference. That also means that increasing it doesn't make much difference to the performance, but may well enable you to run the memory at higher speeds.
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