How do 4 x 1GB sticks run on AM2 boards?

[Lightman]

I have on my desk a Brisbane 3600, an ABIT KN9 Ultra and 4x1Gb of Geil Ultra PC6400. I will definitely let you know how that performs when it's built up.

Just found out it's not a Brisbane but is a Windsor so it will be going back. Testing will have to wait a few days.

I'm getting Brisbane X2 4400+ today and new MSI based on AMD690G so I can put 4x1GB Crucial there as well... Anyone interested??

[dng]

just want to add my $.02 here. Just got another kit of 2x1gb crucial ballistix. i'm running 4 sticks of ballistix on a foxconn c51 and a 3600+ brisbane. the memories are running at 489Mhz at 5-5-5-12 2T. it's been pretty stable so far. 5+ hours of memtest and no errors. i think i can push the mem speed higher, but the 3600+ doesn't like it. how do you calculate the correct bus speed on a brisbane with the odd multi of 9.5? when i boot up the c51, i see current memory speed of 977, is that correct? thanks.

[Lightman]

just want to add my $.02 here. Just got another kit of 2x1gb crucial ballistix. i'm running 4 sticks of ballistix on a foxconn c51 and a 3600+ brisbane. the memories are running at 489Mhz at 5-5-5-12 2T. it's been pretty stable so far. 5+ hours of memtest and no errors. i think i can push the mem speed higher, but the 3600+ doesn't like it. how do you calculate the correct bus speed on a brisbane with the odd multi of 9.5? when i boot up the c51, i see current memory speed of 977, is that correct? thanks.

If your sticks are based on D9GMH then go straight to 4-4-4-12-15 2T. At 2.1V it's easy when clocked 489MHz .

To calculate real memory frequency you can look here: http://www.anandtech.com/cpuchipsets...px?i=2762&p=10

It is same with 65nm Brisbanes, just take your base freq. for example 10.5x200=2100MHz and when memory is set to 800MHz try to find closest integer divider which will result in 800MHz or belove freq.
For X2 4000+ 2100MHz it will be 2100/6=350 (700MHz effective), then when you OC HTT to 250 it will give you 2625MHz core and 437.5MHz memory (875MHz effective).

[dng]

Thanks for the advice. unfortunately my ballistix memories can't do 4-4-4-12-15. it's rated at 2.2v at default, but i have no idea what chips are used. right now i have to set vdimm to 2.3v and i hope that's not too high of a voltage. back to 4-4-4-12-15, i know that the first 4 is CAS latency. The second 4 is RAS to CAS right? what's the third 4? the 15 is TLC correct? I always get confused when i see it written this way . i'll try again to see if i can improve the memory settings in the bios.

[Lightman]

Thanks for the advice. unfortunately my ballistix memories can't do 4-4-4-12-15. it's rated at 2.2v at default, but i have no idea what chips are used. right now i have to set vdimm to 2.3v and i hope that's not too high of a voltage. back to 4-4-4-12-15, i know that the first 4 is CAS latency. The second 4 is RAS to CAS right? what's the third 4? the 15 is TLC correct? I always get confused when i see it written this way . i'll try again to see if i can improve the memory settings in the bios.

Everything is on my screenshot regarding Cas settings

If your dimm default voltage is 2.2V then I think 2.4V/2.5V shouldn't be a problem... Good luck with finding best settings!

[Quintero]

I guess you already got the answers you sought, but better to much than too little, right?

In my experience, AM2 platforms work really great with four sticks. I only had to compromise a few MHz, and the extra interleave and capacity compensate for the insignificant frequency drop. I think the biggest drawback to using four sticks is that the tweaking takes more time.

My 4x1 GB Crucial PC5300 CL5 are stable @ DDR2-1188 @ 2.27 v, and DDR2-1152 @ 2.1 v.

[Lightman]

I guess you already got the answers you sought, but better to much than too little, right?

In my experience, AM2 platforms work really great with four sticks. I only had to compromise a few MHz, and the extra interleave and capacity compensate for the insignificant frequency drop. I think the biggest drawback to using four sticks is that the tweaking takes more time.

My 4x1 GB Crucial PC5300 CL5 are stable @ DDR2-1188 @ 2.27 v, and DDR2-1152 @ 2.1 v.

WOW! Good results

On what mobo you are running and which Crucial PC5300 you have (Value D9GMH?)??

[freakBYnature]

Thanks for the advice. unfortunately my ballistix memories can't do 4-4-4-12-15. it's rated at 2.2v at default, but i have no idea what chips are used. right now i have to set vdimm to 2.3v and i hope that's not too high of a voltage. back to 4-4-4-12-15, i know that the first 4 is CAS latency. The second 4 is RAS to CAS right? what's the third 4? the 15 is TLC correct? I always get confused when i see it written this way . i'll try again to see if i can improve the memory settings in the bios.

All Crucial Ballistic PC6400 are supposedly based on D9GMH chips And they need 2.1~2.2V to do 4-4-4-12-15 2T.

Unlike socket A and somewhat socket 754 and socket 939, 2T doesn't make that big of a difference on AM2. If you have trouble booting on these timings try changing the LAST timing to 19 and see Like this; 4-4-4-12-19 2T
That particulour timing doesn't affect performance that much, but will help stability.

Try these timings... all at 2.1V
In this order:

1: 4-4-4-12-15 2T
2: 4-4-4-12-19 2T
3: 4-4-4-15-15 2T
4: 4-4-4-15-19 2T
5: 4-4-5-15-19 2T
6: 4-5-4-15-19 2T
7: 4-5-5-15-19 2T
8: 5-4-4-12-15 2T
9: 5-4-5-12-15 2T
10: 5-4-5-15-19 2T
11: 5-5-5-15-19 2T

Or any other combinations that I havent written.... it's just a start, but trying all sorts of combinations is THE ONLY WAY to find out what timings your chips like!