CPU: Intel Core 2 Duo E4600 2.4 GHz Motherboard: Gigabyte GA-G33-DS3R Ram: Two sets of Corsair 2x1024-C6400-C4 (4 x 1GB dim; 4-4-4-12, 2T, 2.1 v, 800 mhz FSB) Graphic card: ATI Radeon HD 3870, 512 MB DDR3
The memory fails dramatically on memtest, but this only occurs when the 4 dims are installed. I tryed every memory separately, then in groups of 2, groups of three, using all slots. The modules have also been tested by my local retailer and the same result: memory modules are ok, motherboard is ok. If i put the 4'th module in it fails. I tryed almost all settings i could imagine in BIOS but it still fails.
I may add that i don't want to overclock, i just need this damn system to work.
Stock voltage for that ram is 2.1V, which is what you currently have your memory voltage set to. Bump it up at least another .1V.
The mobo default voltage for memory is 1.8V, so your +3 setting is resulting in 2.1V, which is probably why you are having problems with 4 sticks installed.
The memory voltage is fine at 2.1V, although you can try 2.2V (no more!). The problem is that 4 sticks is pushing the limits of unbuffered memory technology; try boosting the MCH (memory controller) voltage by +0.1V.
Yes. If the MCH voltage boost doesn't work, sept may have better luck by instead buying some *standard* DDR2 memory (rated at 1.8V) and using that instead. There's also the good choice of buying & using just 2x2GB modules.
sept - you might also ask for help on the excellent Corsair support forums (www.asktheramguy.com).
Thank you guys for all the replies. Tried raising the MCH, also lowered the FSB, still no luck. I will consider changing these dimms with 2x2GB but before that i'm ready to experiment a little bit more with these i have right now.
MCHes have an internal mechanism that regulates the strobe scew according to the temperature of the chip. Under very specific test conditions that includes a combination of low MCH core voltage, high
temperature and slow silicon you can get Timing Marginality on the Receive Enable. As suggested previouly setting the DIMM rail to +0.2V and providing better cooling to the MCH should correct your issue. The power consumption when using all 4 DIMMs will increase by about 0.75W per DIMM. So you are looking at 3W for 4 DIMMs.
You may also want to check the actual voltage on your DIMMs when you have 1 and 4 installed so see if you have a load issue.
Also check that the MCH Heatsink clip is seated correctly. If it is lopsided that will for sure cause thermal issues.
You may have to get an additional CPU fan and mount it to the MCH.