FSB versus Memory MHZ

November 25, 2009 at 08:57:08
Specs: Windows XP
If CPU is 800MHZ FSB and memory is 1066MHZ, what is the max MHZ the memory will run at?

See More: FSB versus Memory MHZ

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November 25, 2009 at 09:09:01
depends...what`s your RAM manufacturer ?

it`s NOT safe to go beyond the manufacturer recommened / maximum...

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November 25, 2009 at 09:10:57
General question it is not system specific. If I bought a unit with a CPU at 800MHz FSB and it has 1066MHz memory, what would the max speed the memory run at? Would it actually run at 1066MHz? 800MHz?

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November 25, 2009 at 09:14:30
if you don`t overclock it, it should run at 1066 MHZ...

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Related Solutions

November 25, 2009 at 10:12:30
Fsb 800/4=200 the cpu will run at 200mhz. 1066mhz (Double Data Rate)1066/2=533 the ram will run at 533mhz

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November 25, 2009 at 10:30:09
kuwese's answer is correct. You should always reduce the advertised speeds down to their actual frequencies to make proper comparisons.

Since you mentioned FSB, you're probably asking about an Intel system. For best performance, the CPU:DRAM frequency ratio should either be 1:1 or 1:2. In other words, CPU freq at 200MHz & RAM freq at 200MHz, or CPU freq at 200MHz & RAM freq at 400MHz.

If you leave your settings at their defaults, your ratio would be CPU freq at 200MHz & RAM freq at 533MHz, which is a approx 3:8. That leaves you with two choices...1.) overclock the CPU to 266MHz freq (1066MHz FSB) to hit 1:2, or 2.) underclock the RAM to 400MHz (800MHz DDR) to hit 1:1.

Hopefully you don't have a P4 because the above ratio theory does not apply.

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November 25, 2009 at 17:35:41
In general, overclocking is a bad idea, even if it will work, because the additional question is how long does it work.
If the hardware were made for higher rates, the manufacturer would have selled it as this and you had paid more for this hardware (processor, ram, graphics card).

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November 25, 2009 at 17:52:08
"In general, overclocking is a bad idea, ..."

That's way too broad a statement. In some cases it can be a very bad idea but in other cases a very good idea.

I underclock too but that doesn't make it a better idea than running at default speeds or overclocked speeds.

I'll leave my 2ยข at that before we're all wondering what the original question was.


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