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Problems with my TWINX1024-4000PT


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When I overclock my FSB over 230 I get graphics corruption (tearing) in Nvidia 6800 demos (nalu, timbury & sailing) and far cry. I've tested the memory with memtest and it passes ok. Other than the graphics problem my system is rock stable.


I've also tested with memory as 333MHz and then overclocked the FSB up to 240 so CPU runs at 3.8GHz and memory runs at 200 with no problems, but whatever way I try running things if the memory goes over 230/460 I get corruptions and the higher I go over 230 the worse the corruption gets.


At first I thought I had a problem with my graphics card but it works ok in another pc, also checked the agp clock and it's locked at 66.7/33.5


Bios Settings (Bios ver 3.a)


Frequency/Voltage Control

Performance Mode: Normal

DOT Range: Disabled

DOT Mode: CPU Only

CPU Ratio Selection: Locked

DRAM Frequency (MHz): Auto

Spread Spectrum: Disabled

Adjust CPU Bus Clock (MHz): 240

DDR Clock (MHz): 480

Adjust AGP/PCI Clock (MHz): 66.66/33.33

CPU VCore Adjust: Yes

CPU Voltage: 1.6250V

DDR Power Voltage: 2.85V

AGP Power Voltage: 1.50V


DRAM Timings: Not Set By SPD (3-4-4-8) Burst Length 8


This memory should run at 250 FSB please can you help me.



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Well the CPU you have may not reach that high of an Over Clock. You might check the S-Spec of the CPU against the data base of CPU's at http://www.overclockers.com. But average is about 220-230 Mhz for that CPU!


I've sent you an email with more info but in short I tried setting the DDR Clock to 501 (4:5) and the CPU Clock to 200 but I still get graphics corruption only now it's worse.

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  • Corsair Employees

Please make sure that you have the latest BIOS for your MB and load Setup/optimized default settings, and try the following BIOS settings;

TwinX1024 or TwinX512-4000

Advanced Chipset/DRAM Configuration

Configure Dram timing by SPD: Disabled/User define

SDRAM CAS Latency: 3T

SDRAM RAS to CAS Delay (tRCD): 4T

SDRAM Row Precharge (tRP): 4T

SDRAM Active to Precharge Delay (tRAS): 8T

SDRAM Burst Length: 8 beats

SDRAM Bank Interleave: 4 banks

SDRAM Command Rate: 2T

SDRAM Spread Spectrum: Enabled

Frequency voltage control:

CPU Freq: 200

DRAM Clock: 400 MHz

AGP/PCI Freq: 66/33

Memory or Dim Reference voltage: 2.8/2.85 Volts

AGP Voltage: 1.65 volts

All other settings should be set to default settings!

Then please test them one at a time with http://www.memtest.org and let’s make sure it's not some other issue! I would run the test for at least 2-3 passes to be sure!

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