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Windows 7: Win 7 won't start with 4+ GB RAM

16 Aug 2009   #11


Quote   Quote: Originally Posted by Digital Van View Post
Sorry, was out for a bit, but as far as memory voltage, my bios settings have a max of 2.1V and the memory itself is labeled 2.3V
That may or may not be an issue since the RAM will be running at 6400 (800mhz) possibly requiring less voltage ie It won't need the full 2.3

... also a full length memtest with all 6GB installed ran without issue, and there was nothing wrong.
Unfortunately, one pass of memtest is far from sufficient in determining stability. The general rule of thumb with memtest is:

a few passes for quick tests ie. testing adjustments, 12hrs for a good test and 24hrs and your golden - but it's never a 100% guarantee. I've had RAM give errors at the 8-12 pass area.

With memory timing, it's the CAS Latency timings that are important. For example mixing one module that has a CAS latency of 5-5-5-15 and a module that has 6-6-6-18 would cause instability.

You don't have to buy modules in kits, but it's more important to match the CAS latency. It is possible to adjust the timings so that all ram modules are the same, however it can be a hassle.

I'd ditch the 533mhz for now, and concentrate on matching and getting the 2x2GB modules working first. It also eliminates the need to have all four dimm slots filled requiring any NB voltage adjustment.

Another thing to look for in the BIOS, would be to ensure that the "memory remap feature" is enabled.

For the BIOS itself, have you checked to see if there is an updated version?

My System SpecsSystem Spec
14 Jan 2011   #12

Windows 7 Ultimate x64

I found a working solution in another thread on this board (at least it worked for me!). Just try to update your bios and the whole thing should work.

Good luck!
My System SpecsSystem Spec

 Win 7 won't start with 4+ GB RAM

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