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ASUS P5N-D SLI with 4 RAM modules


carrion

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I tried to use 4x 1GB modules of RAM -Corsair 1024 6400C4DHX but the system goes very very unstable! After many tries and some switch over the modules to see if there is any bad of those.. I ended up to the conclusion that the problem is when all 4 slots of memory are in use. Is this usual for this motherboard?

I tried latencies of 4-4-4 13 - 15 @ 2.1volts and the system got frozen after bios post.

Then I tried latencies of 5-5-5 18 - 22 @ 2.1 volts and the system froze at windows start up.

 

After that I decided to use the 3 modules of RAM and there are no problems.

Is there any way to use all 4 modules of RAM?

 

My ram modules are : CM2X1024-6400C4DHX ver 2.1

CM2X1024-6400C4DHX ver 5.1

 

I'll be very grateful for your help!

 

P.S. Sorry for my English.

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Try dropping the speed down to 667.

 

Is there any point to drop the speed? I'm asking cause the main reason for me to use the 4 gigs is the performance.

And thats why I don't want to stay with the 3 gigs because I would like to take advantage of the dual channel.

If this the only way to make them work, guess I choose the wrong motherboard!

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Using 4 dimm will never run as fast as 2, not on any motherboard. The only way to get "for sure" performance of advertiised specs would be to buy a quad matched set, which are very hard to find. Otherwise it is prety much luck of the draw how well 4 will work.. luck depending on the RAM binning, the Motherboard memory controller, the CPU, Powersupply, etc etc.

 

Generally the only way to get a 4 dimm setup to work is to underclock the ram, even onteh most advanced motherboards.

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With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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I tried to use all 4 modules with different timings.. and the only stable setup was at 667Mhz with latencies of 5-5-5-18-22 @ 2.1 Volts.

With these settings the prime95 was running stable for many hours.

But, I mostly play games with this computer and I saw that the results with 2 dimms are better than 4 dimms at 667MHz.

I didn't know how hard is to setup 4 modules at normal speed (800Mhz) that ASUS says this motherboard supports..

I guess that the best solution now is to get a 4GB kit (2x2048).

 

Carrion

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For gamers, this is the best DRAM population. Your games will run best in this mode.

 

You will note that motherboard manufacturers state a capacity and speed, not a capacity at that speed. They state 8GB and 1066Mhz ( or such ) but they do not state 8GB at 1066Mhz.

 

I guess that the best solution now is to get a 4GB kit (2x2048).
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