Checksum bad with new RAM

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chandos_39

Commendable
Jan 4, 2017
3
0
1,510
I recently tried to upgrade my system (MSI 790FX-GD70) from four gigs of Corsair XMS3 DDR3 to 8 gigs of the same. When I put the two new chips, which are identical to the old chips, into the system, the motherboard times out on Memory Initialization, or d5 on the LED troubleshooter on the mobo. I've checked all of the DIMM slots with my old RAM, and everything functions fine with them. I've tried putting in just the new RAM in DIMM 1/2, in combination with my old RAM in 3/4, and it never works. I got the same results last week with 2 sticks of PNY 4 Gig sticks. When I clear the CMOS and reboot with default settings, I get Checksum bad, but I never even get a post screen unless I do clear the CMOS. Any ideas?
 
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chandos_39

Commendable
Jan 4, 2017
3
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1,510
So, even though the new RAM that I got is identical in every respect to the RAM I'm running atm, other than the version, it still won't work? The descriptor on the new RAM chip is "DDR3 1600mhZ 4GB (2X2GB) 9-9-924 1.65V ver4.19". The RAM I'm running right now is identical, except for the end tag, "ver2.3"
 
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Calvin7

Titan
Feb 19, 2013
11,725
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As you mentioned, the RAM is a different version (2.3). Since the RAM has never been tested together, memory manufacturers make no guarantees they will work together. Some people think they are saving money by making such combinations. If you prefer doing your own compatibility testing, making such combinations can be a waste of money.

It is best to use a single kit, which carries a lifetime guarantee.

If you prefer doing your own compatibility testing, you may find lowering the memory clock to a slower speed may get the modules to work together, that is if you can get the PC to boot up.



 
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chandos_39

Commendable
Jan 4, 2017
3
0
1,510




I called Corsair and did a little more research on low density vs. high density modules and finally understand what you're talking about, and feel that your first answer was on the money. Corsair could only identify one set of XMS3 that they were sure had modules compatible with my mobo and that they couldn't tell me what the configuration of the RAM that worked was based on part or version number. Thanks for the quick replies.
 
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