Solved RAM clocks not consistent

Dell / Dell system inspiron 7720
March 11, 2014 at 11:43:16
Specs: Windows 8, 2.401 GHz Intel i7-3630QM/ 8052 MB DDR3 1600Mhz
This one's not critical but slightly annoying.

I just replace my old Sempron with an Athlon 64 3200+, at 2.2ghz with a multiplier of 11x. Of course, this help immensely what with the 512K of L2. I also try to do some mild overclocking with Systool, by setting up the FSB.

I understand that this isn't the optimal way, but I can't do much else with the OEM BIOS. At any rate, I can usually get the Athlon to 2.4 with leaving the RAM at stock, but if I underclock it (the RAM) using Systool to about ~180Mhz (unofficial) I can get it to 2.5 and have the RAM at about ~200. However, attempting to downclock it doesn't give me consistent results.

If I set it to 180, it gives me 174. If I set it to 166, it gives me 157. If I did this with the Sempron it would end up right on the money at 180 or 166 respectively. It's 2 512Mb sticks of DDR400.

Does this maybe have to do with the fact that it's a 64-bit capable CPU and I only have a 32-bit OS? I don't think this would really matter in the hardware, but I can try a 64-bit Linux boot CD and see if it works.

Not everyone can decipher Klingon script...
chay' ta' SoH tlhe' vam Doch Daq

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March 11, 2014 at 15:13:43
✔ Best Answer
It has to do with the memory divider. The A64/Sempron divider changes when the CPU multiplier changes. I believe your old Sempron was 9x? You now have 11x. That's the reason the memory numbers are different.

I had the following site bookmarked for just such an emergency. Scroll down to 'A64 Mathematics':

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March 11, 2014 at 16:43:56
Ahhhhhh. so ithas to run 'cleanly'... interesting! Thanks riider!

Not everyone can decipher Klingon script...
chay' ta' SoH tlhe' vam Doch Daq

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