Tom's Hardware > Forum > Motherboards & Memory > Asus > M4a785-m only recognizes 2 gb of G.Skill DDR2 1200

M4a785-m only recognizes 2 gb of G.Skill DDR2 1200

Forum Motherboards & Memory : Asus - M4a785-m only recognizes 2 gb of G.Skill DDR2 1200

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jakhead   10-10-2009 at 09:06:17 PM

As the title says, I have a M4A785-M which, according to all available info, should easily support 4gb of ram. I have (2) 2gb G.Skill ripjaws DDR2 1200, but I can only get the machine to boot with one stick. With both, nothing, no post, no output, nada. I read somewhere that this may mean that I have to set my timings manually in order to utilize both sticks. Haven't had much luck tracking down the recommended timing for this ram but i believe it's 6-6-6-18. also, when setting timings in the bios, what's the difference between dct0 and dct1? Tried both with 6-6-6-18 but still won't post. I hope I explained this well enough. Thanks.

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Silver Motherboards badge mongox   10-11-2009 at 05:38:09 AM

Default or auto timing should never keep your system from booting.

Your motherboard specs and manual are located here:
http://usa.asus.com/product.aspx?P_ID=ef0qgvMIwOUagAVl

With the 1 stick installed, go into BIOS and set it to something like Optimal Defaults - whatever step you have up from basic defaults. This will clear any special settings in the BIOS, so be prepared to change back any previous changes you made, like boot order, USB keyboard, etc...

Try both sticks now. If no joy...

Make sure you have the RAM in the right slots. Use the blue slots, A1 and B1. Try them also in slots A2 and B2. Try the single module in both A1 and B1 to see if there's a fault in slot B1.

Look up the voltage specs for your RAM. For example, it might be 1.95V - so set this as the DRAM voltage in BIOS.

------------------------------ Gigabyte MA785GM-US2H, AMD Phenom II x2 550 BE (4 cores@3.6GHz), G.Skill 2x2GB DDR2 1066 (820@CL4), Scythe Katana3, Hec 585W, Samsung 2232BW+, WD Caviar Black 1TB SATA, Sea 500GB USB, 12 IDE HDs w/Masscool IDE-SATA Convertors, Ugly Old Case, Win XP 32bit
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