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TWINX2048-3200C2PT upgrade not working

Larry McNeil

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I had TWINX1024-3200C2 on my system. Added TWINX2048-3200C2PT and now my system runs very bad.

Memtest86+ reports:

With only,


memory 1023 2429 Mb/s

Ram 199 (DDR398)

At 2.5-3-3-8


With only,


memory 2047 2485 Mb/s

Ram 199 (DDR398)

At 3-3-3-8


With both,

TWINX2048-3200C2PT and TWINX2048-3200C2PT

memory 2878 1657 Mb/s

Ram 132 (DDR256)

At 2.5-2-2-6


Is there any way fix this problem?

Thanks for any help.

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Any time you populate all four DRAM slots you lower the performance of the system.


You are adding two different models together. This is never advised nor is it supported. Often you will not get two sets of different modules to play nice together and sometimes even with matched sets they have issues. It is advised to drop your DRAM speed when you populated all four DRAM modules as well as raise the memory controller chipset.

Download memtest from--->

and extract the ISO image. Burn the ISO image to an CD-ROM disk.

Download CPU-z from

Shut the system down. Perform a hard reset to clear any BIOS stack corruption issues.

  1. Shut the system down
  2. Remove the power cord
  3. Remove the CMOS Battery
  4. Set the CMOS_CLR Jumper to On
  5. Press the power button for 10 seconds
  6. Let sit for 10 minutes
  7. Set the CMOS_CLR Jumper to Off
  8. Insert the CMOS Battery
  9. Insert the Power Cord
  10. Restart the system
  11. Enter the BIOS
  12. Load Default Settings
  13. Save Default Settings and Exit, shutting the system down

Enter your BIOS, Load Setup Defaults, Save Setup Defaults and set to these values:

AI Overclock Tweaker


JumperFree Configuration

AI Overclock Tuner: Manual
CPU External Frequency (Mhz): 200 
DRAM Frequency: 333 
AGP/PCI Frequency: 66.6/33.3
CPU Vcore Voltage: Auto
DDR Reference Voltage: 2.8v
AGP VDDQ Voltage: 1.50V 
Performance Mode: Auto 

CPU Configuration:

CPUID Maximum Value Limit: Disabled 
Hyper Threading Technology: Enabled 


Configure DRAM Timing by SPD: Manual
DRAM CAS# Latency = 2.5
DRAM RAS# to CAS# Delay = 3
DRAM RAS# Precharge = 3
DRAM RAS#  Activate to Precharge = 7

Memory Acceleration Mode: Auto
DRAM Idle Times: 16T
DRAM Refresh Rate: 15.6uSec
Graphics Adapter Priority: AGP/PCI
Graphics Adapter Size: Auto
Spread Spectrum: Auto
MPS Revision: 1.4

USB Configuration:

Legacy USB Support: Disabled for Memtest, enabled afterwards if you use a USB Keyboard/Mouse)


Insert a single memory stick in the first slot. Boot to the Memtest CD and allow for two full passes. Remove the stick and insert the second one. Do this with the other two sticks. If error free, shut the system down insert one module into the slot 1 and one module in the slot 3 and boot to the memtest CD. Allow for two full passes. If error free, shut the system down, remove that set and insert the second set in the slot 2 and slot 4. Retest. Finally insert a stick in slot 1 and slot 3 and one in slot 2 and slot 4. Retest.



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