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Tweaking 8 gigs of ram to work

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December 25, 2009 4:25:35 PM

I have 8 gigs of this(kingston hyperx ddr3 1800 cas8) in this . (gigabyte GA-790FXTA-UD5). It is not stable with recommended settings, what setting should I change first? Also is there a way to know which setting to change based on where in memtest it gives me errors?

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December 25, 2009 4:33:36 PM

How many errors in memtest86+ v4.0 is considered acceptable per run?
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a b } Memory
December 26, 2009 7:33:24 PM

Assuming, you started running memtest86+ on the RAM at the stock settings, no errors are acceptable. Isolate your bad RAM and RMA it. If you end your testing/re-testing at stock with two good sticks, you could begin OCing it incrementally with increases to the bus speed. When you get to faster settings that won't POST, increase the volts in small increments to get to POST. After POST, load to memtest86+ using a USB stick, CD, or floppy. If no errors, try higher freqs (speed) on the RAM until you get the RAM freq stable (no errors in memtest86+) at the speed you want.
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a b } Memory
December 27, 2009 10:22:18 PM

If you're using all four slots, set the voltage to 0.05-0.1V over spec if you haven't tried that yet. A lot of times it will take slightly more juice with all four slots filled.

Also, it looks like there may be a weird quirk with your motherboard when trying to run at higher speeds. It says "To reach DDR3 1866MHz or above, you must install two memory modules and install them in the DDR3_3 and DDR3_4 memory sockets."

Now, I don't know whether they mean you'll be OK at anything up to 1865MHz but limited to two slots at 1866MHz, or whether they mean you'll be limited to two slots if you try to do anything over the default 1333MHz. If it's the second one, you either need a new motherboard or just have to be resigned to only operating the RAM at 1333, or operating at 1800 but only 4GB.
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December 28, 2009 12:03:38 AM

I was running the ram at ddr3 1600, I replaced it with another set of memory that runs at spec with 4 sticks but at 2T instead of 1T. Will that harm performance very much?
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a b } Memory
December 28, 2009 3:00:04 AM

No, you won't notice it.
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February 23, 2012 12:39:18 AM

This topic has been closed by Mousemonkey
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