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artifact when running dual channel

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I bought 2 sticks of cmx512-4000pt separately from newegg few days apart and when i run both sticks at the same time i get heavy artifacts when gaming and yet they are fine single stick at a time. same problem persists during 3dmark.


i run them under spec at ddr400 to greatly reduce the artifact problem. I did not OC the system since my ram is screwing up after few ddr500 run boots. however i ran ram/cpu stress tests and everything seemed fine. the problem persists since i upgraded the vid card from 4200 to 6800nu, and no change with different mobos.

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everything has been at default auto for a long time. 2.6c, vcore ddrv both auto. performance mode standard, agp/pic freq auto, external freq 200, dram freq 400. timing 3-4-4-8-8. i've set the mem volts manually to 2.75 and there is no improvement.


all those are basically lowest/safest standard settings and that helps reduce artifact with 2 sticks at the same time. 1 stick at a time i can pump it to 250mhz/ddr500 with no issues. When i bought the sticks in 2003 there was slight artifact an i figured it's not worth the trouble so i kept it at ddr400 speed, now it gets worse.

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  • Corsair Employees

Please make sure that you have the latest bios and then load setup defaults and try these settings.

CPU Freq. 200 MHz

Memory Freq. 200Mhz/400DDR!

Memory Voltage: 2.75 Volts

Memory Timings: Manual/User Define

SDRAM CAS Latency: 3T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 8T

Also this is normally a Video issue so if you have an AGP Video Card I would make sure the AGP Appature is set to 128 Meg as well.

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i left the speed at 200/400 and sped timing up to 3-3-3-8. my agp appature is set at 128mb since i bought the board few years back.


artifact spikes are even less now but couple times during 3dmark it flickered black spikes (artifacts), since my ram is rated DDR500 at 3-4-4-8 looks like my chips weren't binned properly or tested as a set. still can't believe 2 sticks of (what used to be) very expensive DDR500s cant run at rated speed.


artifacts remained after i changed vid cards, yet if i only run single stick both vid cards are fine. it's gotta be the ram, it's not running within spec.

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