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RAM clock problems, can't get stock clock

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joshhua5

Member
Joined
Jan 29, 2010
Greetings,

I've just bought my AMD FX 8150 C: with a GA-990FXA-UD7 board and a lightly obsessive 16GB Corsair 1600MHZ (CMZ16GX3M4A1600C9), but when i run the ram at 1600 I get an error which says system crash due to overclocking then I proceed to boot up at 1333, I'm not even at the point of overclocking and it crashes. Heat is NOT a problem as i even got myself a little ram cooler :3

MEM-copy: 11.2 GB/s
MEM-red : 9.5 GB/s
MEM-write: 8.1GB/s
latency : 81ns

CPU does overclock nicely and right now it's on 4GHZ waiting for a H100
 
Secondly I would like to turn off that seconds core in the module for heat and decode bottleneck reasons, but my BIOS doesn't have a feature (yet) so is there a way i can do this though windows for the whole system?
 
I am having the same problem. Just bought AMD FX-8150, GA-990FXA-UD3, updated to latest F5 BIOS and (4 x 4GB) G.Skill Sniper DDR3 1866. The memory is advertised as 1.5v 9 CAS 9-10-9-28 timing and recommended for AM3+ Mobo. Here's what I had to do:

1) Remove 2 sticks so that only DDR3_1 & DDR3_2 are populated. (See Note 1)
2) Set BIOS as follows:
Set Memory Clock [Manual]
Memory Clock [x9.33] 1866Mhz
System Voltage Control [Manual]
DRAM Voltage Control [1.5000v]

DRAM Configuration
DDR3 Timing Items [Manual]
1T/2T Command Timing [2T]
CAS# latency [9T]
RAS to CAS R/W Delay [10T]
Row Precharge Time [9T]
Minimum RAS Active time [28T]
Row Cycle Time [35T]

Viola! DDR3 1866 reported at bootup and CPU-Z...

Note 1 - From what I've researched on this subject, Gigabyte fudged on their specs. To my knowledge, no one has been able to obtain 1866Mhz with 4 sticks of RAM. Reducing to 2 sticks however will do the trick - IF you manually set it up in BIOS. The on chip SPD settings are optimized for Intel... not for AMD. This is apparently why you set it up manually.
 
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