Lowering memery bus

[Intelman07]

I was overclocking and I had a setting on my motherboard to lower my memory bus 33 mhz less than the fsb. So I did so I could overlock and my memory is now running at 117 Mhz bus. My cpu is at 150. Will this result in a lower performance?

 

[Duvie]

yes....effectively you are running pc1850 ddr for a max bandwidth of 1.85gb/s....yet the nice 150x4=600fsb of the p4 you created has a theoretical bandwidth of 4.8gb/s....If I was guessing and assuming you have a 1.6ghz cpu which you are running 2.4ghz, I would say you are likley equivalent to a 2.25ghz cpu ran with ppl running pc800 rdram or pc2700dd and even worse against ppl running pc1066 rdram or pc400ddr....

I notice my cpu at 1.6@2.624 w/437mhz drr was equal in perfomance in a lot of apps I run and tested to my 1.6@2.72ghz w/340mhz ddr....

Run some test, but in some apps it would better for you to lower the fsb to run the memory higher....

Why are you running memory so low?? You now the memory wont run 300mhz or pc2400??? Even at lowest ram timings??

 

[Lizardman]

Try running your multiplier with at 1:1 fsb to memory ratio that should work good.

 

[Intelman07]

Sry for the mis comunication but this is on my pentium 3 machine. It is a 800EB now at 900@150mhz bus. My memory can't handle that much it can handle 140 but not more. I had to lower it. Will this be worse than 840EB with 140mhz bus or better?

 

[gururu]

So you are running memory at PC117 vs. PC133...

But you are getting 900 MHz(fsb 150), vs 800 MHz(fsb 133).

one simple solution: Run benchmarks with both configurations.

I bet you will get maximal performance at 846 MHz(fsb 140) and PC140 memory.