Confused with memory timings

[TheGlazer]

Crucial Ballistix PC6400 800mhz.

I'm on 2.1v and I'm changed my timing from 4-4-4-12-4 to 4-3-3-9-4.........

Yet, On Sandra, for the memory bandwith, and memory latency tests, I'm getting higher scores...........

For memory bandwith, I was at 6675/6705 mb/s, and this number has increased.........

For memory Latency, I was at 104 n/s(memory Latency) and 103.8 n/s(Speed)....... and these numbers have also increased.........

According to "Interpretation", vales are better if lower.......but they are getting higher......... but my timings are tighter.......... what's going on?!??!?!

 

[gurusan]

104n/s!! wow.

What FSB are you running?

 

[veedubfreak]

First thing you need to do is run memtest at those latencies and make sure that they are stable. What is probably happening is you are getting errors due to the timings being to tight which will cause a performance hit.

 

[TheGlazer]

Gurusan, my FSB is 1500
My CPU is overclocked at 375x8 = 3Ghz; I'm sure I can overclock higher (haven't tried), but I've reached my goal of 3ghz already. I'm idling at 22-23C and 44C on load.

The only thing that's bothering me is my RAM now. I've ran Orthos and Prime for over 9 hours with no errors at 2.1Vdimm 4-3-3-9. I'm running 1:1, so i'm at 750mhz. I tried to loosen my timings to 5-5-515 at 938mhz @ 2.1Vdimm(That's the next option up), but my computer becomes unstable. I'm not sure how much Vdimm is safe, as I don't want to run too high of a Vdimm.

at 4-4-4-9, I get 6618mb/s, and at 4-3-3-9, I get 6313mb/s.......... why is tighter timings giving me worse performance? And my latency gets worse too...........

 

[gurusan]

375 is a deadspot int he p5b deluxe in terms of memory performance.

Drop your multi to 7x ....jump straight to 401mhz, set your timings to 4,4,4,12 and ram to 1:1 ratio.

That will give you 802mhz ram, then do a benchmark to see if you have your latency and bandwidth back. Then you can go back and set your multiplier to 8x and have 3208mhz Might need some more vcore for that but shouldn't need too much. Even really, really bad stepping e6400s do 3.2ghz on 1.4ish

 

[TheGlazer]

What numbers should I be looking for interms of memory bandwith and latency Guru? I'm set at 1.3Vcore In the BIOS at the moment, so I think I shouldn't need too much juice to run 401.

 

[gurusan]

Should be high 50s to mid 60ish ns latencies...not sure on the bandwidth though. I get over 8500mb/s but am currently running 1058mhz

 

[TheGlazer]

Thx a lot Guru, I'm going to try those settings right now. Much appreciated.


UPDATE

Ok, I did exactly as your said; I'm now at 3208.84 mhz @ 1.3375 Vcore and running prime to ensure stability, and see if I can lower my Vcore a notch.
However, My Latency is only @ 85ns........and Bandwith @ 6773mb/s........... I'm still not getting to the 60ish for latency and 7000s for my Bandwith.......... I dunno if this will help, but I'll give you my info. for timings
4-4-4-12-4-20-10-10-10-11 @ 2.1Vdimm running 801.