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1333mhz cpu w/ 1066mhz mb

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July 2, 2009 11:16:14 PM

I currently have an e6400 and i was looking at upgrading, but my current mb has an fsb of 1066mhz
i was considering upgrading to an e6850 or x6800. the 6850 is cheaper but it has an fsb of 1333mhz
i heard that if i do go w/ the 6850 the cpu will run at about 3/4 which is 2.25ghz instead of 3. i understand the fsb going down a ~25%, but also the clock speed?
i only have $90 for this upgrade. the 6800 still seems to be over 100 on ebay while the 6850 is under 100
should i just wait till the 6800 are under 100 or will performance be nearly identical

More about : 1333mhz cpu 1066mhz

a c 159 à CPUs
July 3, 2009 1:21:14 AM

Get yourself a g31 board open box at newegg. They sell for about $30 plus shipping. They should fit in your case. Biostar will ship you a free backplate if you request it by email. Then check microcenter for the e8200, and see if they still have any for $99.99.
July 3, 2009 2:07:21 AM

my computer is currently in a ubtx case
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July 3, 2009 3:25:20 AM

Intel's Processor Spec Finder shows that the E6400's CPU Multiplier is 8x. Your 1066FSB mobo is running a quad-pumped 266MHz clock. 266 x 8 = 2.16GHz processor speed.

The E6850 runs a 9x CPU Multiplier on a 1333FSB which is a quad-pumped 333MHz clock. 333 x 9 = 3GHz. Run it on a 1066FSB and you get 266 x 9 = 2.4GHz. So you'd be picking up a little speed over your E6400 along with doubling your L2 cache from 2MB to 4MB. Up to you if that's worth it.

Given that you're limited to only $90 to upgrade with, I'd think it would make more sense to overclock your motherboard (if that's possible - you don't give much information) and spend your money instead on a better CPU cooler. There are many LGA775 boards out there that easily overclock to 1600FSB. That would give you 400 x 8 = 3.2GHz processor speed with your current E6400 (plus you could then run most RAM synchonously (a 1:1 clock-to-DIMM ratio) at 800Mhz (400MHz clock x Double Data Rate) which yields it's own benefits.

Alternatively, if your mobo's BIOS supports 45nm CPU's (check the mfr web site), the E7400-7500-7600 all run on 1066FSB natively with higher CPU multipliers of 10.5x, 11x and 11.5x respectively (though with only 3Mb of L2 cache) and start at less than the E6850. Combine a higher CPU Multiplier with an FSB overclock and you could see way over 4GHz processor speeds.

This is all pretty basic stuff though. Good luck.
July 3, 2009 9:31:01 AM

1onething..Could you tell us what motherboard you have?
a c 309 à CPUs
July 3, 2009 3:05:34 PM

I don't think a modern 45nm cpu needing a 1333 fsb will run on a 1066 motherboard. It is not a matter of speed, it is a matter of voltage controls.
To verify this, go to the mobo web site, and look at a list of supported cpu's.
Be certain you know what revision level your mobo is, and what bios you are using. CPU-Z will show you that info.
July 3, 2009 11:35:13 PM

geofelt said:
I don't think a modern 45nm cpu needing a 1333 fsb will run on a 1066 motherboard. It is not a matter of speed, it is a matter of voltage controls.

Why not? In point of fact many 1066FSB mobo's DO support E8x00-series and Q8x00/Q9x00-series CPU's (45nm, 1333FSB) though a fairly recent BIOS version will be required.

At a minimum, many 1066FSB motherboards based on the Intel P965 chipset (the entire Asus P5B-series for example) support 45nm CPU's needing a 1333FSB.

I'd be suprised if no Nvidia 1066FSB chipset's carried similar CPU support (I'm too lazy to look it up now) and even the older Intel i975X chipset has (limited) support for such CPU's (due to chipset limitations).

See for yourself:
http://support.asus.com/cpusupport/cpusupport.aspx?SLan...

Regards.
a c 309 à CPUs
July 4, 2009 2:28:43 AM

Clones123 said:
Why not? In point of fact many 1066FSB mobo's DO support E8x00-series and Q8x00/Q9x00-series CPU's (45nm, 1333FSB) though a fairly recent BIOS version will be required.

At a minimum, many 1066FSB motherboards based on the Intel P965 chipset (the entire Asus P5B-series for example) support 45nm CPU's needing a 1333FSB.

I'd be suprised if no Nvidia 1066FSB chipset's carried similar CPU support (I'm too lazy to look it up now) and even the older Intel i975X chipset has (limited) support for such CPU's (due to chipset limitations).

See for yourself:
http://support.asus.com/cpusupport/cpusupport.aspx?SLan...

Regards.

I stand corrected. I could find some asus motherboards with <1333fsb that support 45nm E8xxx cpu's. I don't know how pervasive this support is, since 1333 fsb shows up on most modern motherboards. In any case, we would want to know the OP's motherboard, it's revision level, and bios level to see if the e6850 or whatever will run.
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