Solved Aspire M5620 Ram Compatibility issue

February 28, 2012 at 23:48:34
Specs: Windows 7
I have an Aspire M5620 with Intel® Core™2 Quad Processor Q6600 2.40 GHz, 1066 MHz FSB and my bios is locked and i can't underclock DDR2-800MHz lower that 667MHz. I want to know if I install 533MHz memory will it work on this system?

See More: Aspire M5620 Ram Compatibility issue

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February 29, 2012 at 00:25:13

The memory advisor tool will list compatible memory................

Googling is quicker than waiting for an answer....

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February 29, 2012 at 01:32:23
crucial lists PC2-8500 1066hmz as being supported even if in my bios I can only set ram frequency at 800hmz or 667mhz.

- will my bios underclock PC2-8500 1066hmz automatically at one of these two frequencies? and if not will i get more performance with this?

- As I can't set the ram to 533mhz (actual clock 266) to match my processor's clock frequency what's the recommended Ram frequency for best performance in these conditions.

At 333 actual clock memory speed:
CPU-z gives me a FSB:DRAM 4:5 ration
Aida64 Extreme gives me a DRAM:FSB ratio 10:8

At 400 actual clock memory speed:
CPU-z gives me a FSB:DRAM 2:3 ration
Aida64 Extreme gives me a DRAM:FSB ratio 12:8

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February 29, 2012 at 05:14:19
✔ Best Answer
The preferred CPU:DRAM ratios** for a Core 2 system are 1:1 or 1:2, but you can only work with the options provided in the BIOS. Ideally, you should be running DDR2-1066 but there's no point changing the RAM just to chase down the ideal ratio. The performance difference is minor. Just stick with what you have.

** Ratio is based on frequency, not the bogus QDR or DDR ratings. Both CPUZ & AIDA64 are reporting the exact same thing, but for some reason, AIDA64 does it backwards, DRAM:CPU instead of CPU:DRAM, plus it doesn't reduce the numbers to the lowest possible. 10:8 = 5:4, 12:8 = 3:2.

266:266 = 1:1
266:333 = 4:5
266:400 = 2:3
266: 533 = 1:2

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February 29, 2012 at 08:33:49
id say stick to what u have, if u can go for a ram with DDR2-1066 it would be good to acheive a 1:2 ratio but u gotta know if u board supports that kind of ram

computers are a second home

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February 29, 2012 at 10:20:23
Thank you for your replies.

Aida64 shows that my mobo supports DDR2-1066 theoretically but practically the bios is locked at 667 or 800 MHz.

I have DDR2-800 and i can set it either to 800mhz or 667mhz what's the best? The auto setting on bios undercklock it to 667mhz.

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February 29, 2012 at 12:10:49
Set it to AUTO or DDR2-800 & call it a day. And yes, your system does support DDR2-1066, but it would be pointless to upgrade because you would have to replace ALL the RAM. 4GB (2 x 2GB) will cost you at least $80. That's a lot to spend for a minimal performance gain. But if you do decide to go for it anyway, choose your RAM wisely. Make sure the default voltage is 1.8v, NOT 2.0v or higher.

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