I have Schrodinger's RAM

Muzical

Reputable
Jun 15, 2015
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4,510
Some of what I tried is already noted over here, but I'm still coming up empty...

Short version is that, with 16GB over 4 sticks in a Gigabyte AMD mobo, how much RAM I "actually" have is varying wildly depending on what software you ask, and it sure as snot doesn't FEEL Like 16GB when I'm lagging while using Steam 🙁 There's no configuration of the sticks that gives me more than 8GB, and I don't know why the memory is reporting as single channel now when it was always dual before. In late December/early January of this year, ALL FOUR sticks checked out as fine in MemTest86+, and since there's zero difference in effect with any combo of sticks-to-slots, I'm not inclined to think that the problem is my RAM itself. Windows reports 12GB, but "7.98GB usable," and Gigabyte's own tools are schizophrenic on the matter.

Specs are at the link in exhaustive detail, but mobo is a GIGABYTE GA-990FXA-UD3 with a 6-core AMD FX-6100, and the RAM is 4 sticks of 4GB G.SKILL Sniper Series 8GB 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) (That's all from NewEgg, if I accidentally omitted important information, I apologize.)

If the mobo is, in fact, dying, recommendations on a replacement? If I CAN hold out until the AM4 boards come out, I would rather, (while I intend to use my current CPU, I like options for the future,) but if I can't, I can't... If there's any chance of whatever's wrong here frying my other hardware or otherwise causing harm, I would rather use another AM3+ board than risk that :ouch:

Any help/guidance I can get is APPRECIATED. I hate not trusting my gaming machine during Steam's Summer Sale :??:
 
Solution
G.SKILL Model F3-14900CL9S-4GBXL
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231720

Single modules are not guaranteed for compatibility when combined in multiples.

AMD FX CPUs support 1866MHz clock speed with one DIMM per channel.
AMD FX CPUs support 1600MHz clock speed with two DIMMs per channel.

The memory clock, DRAM Timings, and DRAM voltage should also be set in the BIOS. Just leaving everything on [Auto] will just leave these settings on the conservative SPD (Serial Presence Detect) settings.
To clarify: each of the four sticks shows up as 4GB in BIOS and memtest86+ and they all pass memtest86+? If you install a pair in the recommended slots for dual-channel (slots 1 and 2?) BIOS and memtest86+ agree that you've got 8GB in dual-channel and they pass memtest86+?

When all four DIMMs are installed are you trying to run at 1866? If so, try slowing them down to 1333 and see if that makes things better (having two DIMMs on each channel makes for a more difficult electrical environment and running them slower may make it easier for them).
 
G.SKILL Model F3-14900CL9S-4GBXL
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231720

Single modules are not guaranteed for compatibility when combined in multiples.

AMD FX CPUs support 1866MHz clock speed with one DIMM per channel.
AMD FX CPUs support 1600MHz clock speed with two DIMMs per channel.

The memory clock, DRAM Timings, and DRAM voltage should also be set in the BIOS. Just leaving everything on [Auto] will just leave these settings on the conservative SPD (Serial Presence Detect) settings.
 
Solution