Does this mean I am being limited by my memory controller?

[yliu]

Hi,

On my MSI K8N Neo2 Platinum mobo and winchester 3500+ system, I have a dual channel kit from patriot memory (two sticks of 512MB TCCD memory). I can use each stick by itself at DDR 600 (300Mhz, 2.5-4-4-10) and pass memtest, but using them together in dual channel mode will fail memtest's test 5 with thousands of errors. Does this mean that I am being limited by my CPU's memory controller? Or could I still have better luck with better memory?

 

[Duvie]

this is at what??? 9x300 or 8x300???

All I can say the higher the HTT and clock speed the more sensitive the memory controller gets...

For example...

I can run 8x300 at cas 3,4,4,10 but cant do it at 9x300 even if the cpu is stable....

I cab run 8x275 at cas 2.5,3,3,7 (rated specs) but cant do it at 9x275 even though that speed run defualt vcore....needs cas 3 to be stable

I can run 8x285 cas 2.5,3,3,10 but cant run 9x285 at any cas 3 settings stable...again at speed where default vcore is stil in place...


The higher I go in clock speed the harder it gets to hold...Now some say it was the higher the HTT but that is actually not right since at 8x300 I can run very nice cas 3,3,3,10 timings stable....

Everything above was with 1t...I could get 9x285 stable only with dropping to 2t

 

[yliu]

My tests was done using 7x300 which is lower than the stock speed.. Hm, your description is interesting... It means that the usual "isolate & consolidate" approach may not work?

 

[Duvie]

Originally posted by: yliu
My tests was done using 7x300 which is lower than the stock speed.. Hm, your description is interesting... It means that the usual "isolate & consolidate" approach may not work?

NO....It still works....Just dont expect the ram once you get a combination of high clock and HTT to run at spec without a lot more voltage and maybe still not enough....


Your situation appears different...It goes against thislogic so maybe there is something else...What vdimm have you tried??? waht acs timings have you tried....Have you tried different slots???

 

[yliu]

I have tried VDIMM 2.75, 2.8, and 2.85 in the BIOS. 2.85 generates slightly less errors than the other two (but still thousands)

The timings I've tried for dual channel include 2.5-3-3-7, 2.5-3-3-10, 2.5-3-4-10, 2.5-4-3-10,2.5-4-4-10, and 3-4-4-10, which all failed. For single stick I've only tried 2.5-4-4-10

The tests above were on slots 1 &2, though I believe i once tested 290Mhz on 3&4 and it failed... maybe I will test it again in 3&4. I liked it in 1&2 because it gets some of the air flow from the fan on the XP-90