Overclocking Corsair Vengeance Pro to listed 2133MHz with AMD A4-7300 APU issues

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G19shooter

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Jul 7, 2015
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I have just build my first computer and am having issues getting the ram stable at the listed 2133MHz. The ram is a 2x4GB Corsair Vengeance Pro 2133MHz 11-11-11-27 @ 1.5 volts.

My setup:

Gigabyte F2A88XM-D3H (rev 3.1) with BIOS F8
Corsair Vengeance Pro 2133MHz
WD 1TB blue HDD
AMD A4-7300 APU with stock heatsink
OS: Elementary OS Freya (Linux)

My ram was initially reading 1333MHz with timings at 9-9-9-24 @ 1.51 volts. My board can read XMP profile 1 and when enabled, my readings are: 2133MHz 11-11-11-24 @ 1.54v (slightly off from what's on the sticker of the ram being 11-11-11-27 @ 1.5v). However after reboot, I get an error message saying there was a failure to boot due to possible setting being incorrect in the bios, and I have to go back to the recommended default settings.

I Also entered the values on the ram manually: 2133MHz 11-11-11-27 @ 1.50v and got the same error message and had to revert to defaults.

I noticed I can set the ram to 1866MHz @ 1.5v with timings at 9-9-9-24 or 10-10-10-27 or 11-11-11-27 and all pass POST, however the bios reads 8GB installed, 4GB enabled. As I increase the voltage the bios reads the correct amount of ram installed, but less amount of ram enabled: 4GB enabled at 1.5v, 2GB enabled at 1.52v, 1GB enabled at 1.55v etc.

I tried turning the volts down a bit at 1.48v while setting the clock to 1866MHz and the bios still reads 8GB installed, 4GB enabled.

With all that said, the best I am able to do is set my ram (which it's currently running at): 1600MHz 9-9-9-24 at 1.50 volts, with the bios properly reading 8GB installed, 8GB enabled.

I have also ran a memory test with memtest86+ and did a single pass with no errors.

Can anyone give me some advice on getting this ram to run at the listed 2133MHz?

Any advice would be greatly appreciated.
 
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G19shooter

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Jul 7, 2015
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Update: I also noticed that my two ram dims are in slots ddr3_1 and ddr3_2 (both gray slots--the other slots are black.) However, in BIOS it says my ram dims are in slots 3 and 4? Would this have anything to do with me not being able to get 2133MHz on the ram? Also, does the APU have anything to do with ram speed? The A4 7300 being AMD's lowest APU, I was wondering if this APU maybe couldn't handle 2133MHz ram, or does the APU not effect ram speed at all?
 
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G19shooter

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Jul 7, 2015
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Tried these settings:

2133MHz with timings 11-11-11-27 @ 1.55 volts. Does not pass POST. Failure to boot. Requires recommended default settings.

Currently I am running at: 1600MHz with timings 9-9-9-24 @ 1.50 volts. Any higher clock speed (1866MHz) and my "enabled" ram is half of what is installed (example: 8GB installed, 4GB enabled @ 1.50 volts.) As the volts increase with higher clock speed beyond 1600MHz the ram enabled continues to divide in half.

Any other tips?
 
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G19shooter

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Above each slot on the board, there are marking: ddr3_4, ddr3_2, ddr3_3, ddr3_1 in that order. The physical locations the slots where the ram sticks are installed are technically 1 and 3 as shown below:

|4| |3| |2| |1|

(hopes that makes sense. I double checked the manual and they are correctly installed per dual channel mode (the gray slots.))

Each individual ram stick works. Also did 3 passes with memtest and it passed with 0 errors.
 
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G19shooter

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Could someone tell me if any of this might be related to my lower end AMD APU (A4-7300)? If I upgrade to A10-7870K might the ram xmp profile_1 work, or does this issue have nothing to do with the APU?

I would love to upgrade my APU, but think it would be a waste if I cannot get my ram stable beyond 1600MHz. :(
 
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G19shooter

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Jul 7, 2015
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Can anyone help me out with this question?

UPDATE: Problem solved. I upgraded to an 860K CPU (along with a R9 270 GPU) and the RAM profile_1 worked perfectly. RAM is running stable at 2133 MHz. I guess the issue was the A4 APU all along.
 
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