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P4P800 deluxe with Corsair Twinx 256 Mo and 512 Mo 3200C2PT =>no boot


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Hi all!


Maybe could you help me on this.


I got a P4P800 deluxe motherboard (updated bios) with a pair of 256 MO Twinx 3200C2PT in dual channel.


I purchased today a pair of 512 Mo Twinx 3200C2PT..


When I install them, my system won't boot (got Three short beep on power on).


From what I read, they seems compatible with my system..


any idea?



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Yes, you're right! thanks for the response.

I will surely swap them ;) I haven't saw that this sticks are Registered memory!


by the way, do you think that 512 3200C2PT show work as a second dual channel along my dual 256 CMX256A 3220C2PT XMS32002v1.2 ? or is there a better solution?

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Thanks RAM GUY!


I'll get my 3200LL this afternoon.


a final question: what will be for you the best BIOS configuration for this settings?


Motherboard: P4P800 Deluxe

Memory : a pair of CMX256A 3200C2PT XMS32002v1.2

a pair of 1024-3200LL

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  • Corsair Employee
Please follow the link in my signature, and look up the module you have, all of our XMS modules are listed by part# along with the make and model of MB we use to validate them and the bios settings used in production!
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DRAM Clock: 200 MHz

SDRAM CAS Latency: 2T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 2T

SDRAM Active to Precharge Delay (tRAS): 6T

SDRAM Bank Interleave: 4 Bank

All other settings are motherboard defaults.

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Thank you,


I got a problem with my new gear:

(sum up:

P4P800 deluxe

pair of twinx platinum 256 Mo 3200C2PT

Pair of twinx 512 3200LLPT



system is functionnal, but:

- Sandra tells me that memory speed is 320

- 256 Mo pair is seen as a 512 Memory on bank 0 but it tells me that each 512 Mo ram are separated elements (so i doubt that dual channel is active)


same problem when I put only the pair of 3200LL on the MB.


do you know how to work this around?

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