Neo2 Plat, 1x512 253Mhz, 2x512 only 205Mhz? (BH-5)

[enroscado]

Hello all.

MSI K8N Neo2 Platinum
San Diego 4000+ watercooled
VIO=Vdimm mod, 3.3V line set to 3.4V

Two sticks of Corsair 3200LL 1.1 (old BH-5)

Individually, both sticks are good up to around 252-253Mhz at 3.4V
Toghether (dual channel) they wont pass memtest at more than 205.

On a side note, i also have 2 sticks of khx3200 BH-5, that are good up to 260MHz in the same setup, running dual channel. And up to 275 at 3.7V. SO i guess the IMC of the San Diego is not that bad.

What can be holding the 512MB sticks back in dual channel?
Could it be lack of power?

[BeSaiD]

What's your PSU and how many W does it have?

Off-topic:

From which part of argentina are you from? :D

[enroscado]

Right now i'm using a crappy Tt480W, but it's the same with a OCZ 520W.

OT: Soy de San Juan, pero vivo en Cordoba. Conoces Argentina?

[alexio]

Try to mix te Corsair with the Kingston and see what happens then.

*well I assume that the Corsair is 512mb and the Kinston is 256mb. Maybe you just have a crappy memory controller. If you can, you should try other BH-5 or UTT stuff 512mb's to see if it does like 2*512mb at all. You could also try 2T.

[enroscado]

alexio, yes, forgot to say that. The corsair is 2x512 and the kingston is 2x256.

I'll try mixing the sticks.

[enroscado]

Does anyone know if it has anything to do with VDD or VTT not tracking correctly with the VIO=VDDR mod?