Overclock DRAM but can't overclock CPU Bus?

Question

Perhaps you can help,
I've been lurking here for a few weeks and have used your sage advice to boost my 1.8 Ghz P4 to 2.25 by adjusting the DRAM freq from Auto to 333.  I'd like to get a bit more speed out of it but the CPU bus gets greyed out when the DRAM Freq is anything other than Auto.  I tried 400 on the Dram but no post (Oh, so that's where the jbat1 jumper is... )  Would a bios upgrade enable the DRAM overclock WITH the CPU overclock or am I hardware constrained?  
Thanks

Answer 1

Yes; your CPU, Can be moved to a higher clock speed, but be careful, as You did Mention that you Increased your FSB (Front Side Bus) Speed, or CPU Speed From 100 MHZ to 125 MHZ, Which tells Me that your P-4 CPU is of the Older "Willamette" Core, which are not known to be as good Overclockers as the Newer "Northwood" Core P-4's......So You have problably only a little more room as far as overclocking goes, And Make sure that you keep your eye on the CPU temperature, as you do NOT want it getting into the +60C Range for long periods...So as babyfaceuk has stated, you are indeed Overcloking Both the CPU and The Memory Bus when you Increase the CPU (Or as Most call it the FSB) speed, and dont forget that you have in the sense of the word, Underclocked your DRAM, by Changing (Lowering) the Ratio to 333 MHZ, or 5:4, when the Memory is Rated to run at 400 MHZ speeds, so you have to look Benchmark wise, Are you getting Better Scores by underclocking your Memory in order to overclock your CPU, or would you get better Scores by leaving your Memory set to 400 MHZ, or a 1:1 Ratio, and only Bring your FSB, or CPU speed to 108 MHZ or 110 MHZ? ....These are things that you have to try, As I think that you would be suprised at how High you can Get your Benchmark Scores, or overall Performance to Increase with a happy medium between both CPU and Memory, and on top of it all, Your system will run Better overall at a 1:1(400 MHZ Memory) Syncronous Ratio .....But thats Just My Opinion..........Sean REILLY875