need help getting rated 250MHz on corsair 4000pt s

[tompson]

I can't get the 2048-4000PTs that I have prime95 stable at their rated 250MHz...

I've put the CPU multiplier down to 6x,
Vmem = 2.8V,
Vcpu = 1.35 x 1.144% = 1.5444
1T timing,
1:1 mem dividor,
4x HTT multiplier,
All over voltages are at stock,

and the memory settings are:

Command Per Clock (CPC)....................... - Enabled
CAS Latency Control (Tcl)..................... - 3
RAS# to CAS# delay (Trcd)..................... - 4
Min RAS# active time (Tras)................... - 10
Row precharge time (Trp)...................... - 4
Row Cycle time (Trc).......................... - 14 Bus Clocks
Row refresh cyc time (Trfc)................... - 20 Bus Clocks
Row to Row delay (Trrd)....................... - 02 Bus Clocks
Write recovery time (Twr)..................... - 03 Bus Clocks
Write to Read delay (Twtr).................... - 02 Bus Clocks
Read to Write delay (Trwt).................... - 03 Bus Clocks
Refresh Period (Tref)......................... - Auto
DRAM Bank Interleave.......................... - Enabled

DQS Skew Control.............................. - Auto
DQS Skew Value................................ - 0
DRAM Drive Strength........................... - 08
DRAM Data Drive Strength...................... - 04
Max Async Latency............................. - Auto
DRAM Response Time............................ - Fast
Read Preamble Time............................ - Auto
IdleCycle Limit............................... - 256 Cycles
Dynamic Counter............................... - Disable
R/W Queue Bypass.............................. - 16 x
Bypass Max.................................... - 07 x
32 Byte Granularity........................... - Disable(4 Bursts)


These timings should be pretty relaxed but I can only get prime95 stable (tested for 3 hours) up to FSB of 243MHz... A LONG WAY OFF 250MHz.

Adding more voltage to memory doesn't help. Does anyone know what the Tref should be for these dimms? 7.8us??? 15.6us??? Also, what should the drive strength and data drive strength settings be for these dims?

Someone please help, I've been trying for a while here.

Thanks,
Jonathan

2 X eVGA e-Geforce 7800 GTX KO video card @ 490GPU & 1300 Memory
PC Power and Cooling 1kW PS
Corsair 2GB (2 x 1GB) TWINX2048-4000PT XMS (250MHz)
AMD Athlon 64 X2 4800+ CPU
2 X Western Digital 8MB buffer, 74GB Raptor in Raid 0 array
DFI LANParty nForce4 Expert
Lian-Li PC-V1200 Plus case modified with window
Dell UltraSharp 2405FPW 24-inch Wide Aspect Flat Panel LCD Monitor
IBM Thinkvision L190 19" LCD Monitor
Sound Blaster X-Fi Fatal1ty FPS
Logitech Z-5500 digital 5:1 speaker system

Watercooling stuff:
black ice extreme III and 3 panflo M1A fans
Danger Den D5 pump
Swiftech Storm CPU block
Danger Den maze4 GPU blocks and ******** ram heatsinks
Typhoon 120x large blue reservior

 

[tekzor]

corsair sucks what else do u want? get new ram?

 

[tompson]

very helpful