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What's the difference?

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October 4, 2010 8:40:45 PM

Curious as to what is the difference between these 2 AMD CPUs. Both are Propus; one is 2.9GHz and the other is 3.0GHz. Both are $100. Seems that the 3.0 would be slightly faster for the same price.

AMD Athlon II X4 640 Propus 3.0GHz 4 x 512KB L2 Cache Socket AM3 95W Quad-Core Desktop Processor ADX640WFGMBOX
AMD Athlon II X4 635 Propus 2.9GHz 4 x 512KB L2 Cache Socket AM3 95W Quad-Core Desktop Processor ADX635WFGMBOX

Any advantage to spend an extra $16 and get this?
AMD Phenom II X4 810 Deneb 2.6GHz 4 x 512KB L2 Cache 4MB L3 Cache Socket AM3 95W Quad-Core Processor HDX810WFGIBOX

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October 4, 2010 8:45:32 PM

Yup that's the only difference, that 0.1Ghz more. I'd go for it seems its the same price.
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October 4, 2010 10:58:32 PM

Unless your applications need it I don't see where the L3 cache on the 810 would be worth it. (Rule of thumb, if you don't know you need it you probably don't.)
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October 5, 2010 12:43:31 AM

Thanks for the replies. Sounds like for my purposes the 3.0 Propos would work just fine. A quad core for $100 sounds like a great deal. No gaming planned, light video editing and photo restoration (Photoshop CS4)
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October 5, 2010 12:55:04 AM

The 635 is a C2 stepping --- I imagine the 640 is C3 but I don't really know.

The PhII 810 is quite the little spunky OC'er -- should blow past the Athlon quads without much difficulty (assuming your motherboard is of decent quality).

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October 5, 2010 2:30:06 AM

Wisecracker said:
The 635 is a C2 stepping --- I imagine the 640 is C3 but I don't really know.

The PhII 810 is quite the little spunky OC'er -- should blow past the Athlon quads without much difficulty (assuming your motherboard is of decent quality).

Thanks for the tip. It does look good and only $16 more. Here is the MB I'm considering:
ASUS M4A88TD-V EVO/USB3 AM3 AMD 880G SATA 6Gb/s USB 3.0 HDMI ATX
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October 5, 2010 12:19:28 PM

highcountryrider said:
Thanks for the tip. It does look good and only $16 more. Here is the MB I'm considering:
ASUS M4A88TD-V EVO/USB3 AM3 AMD 880G SATA 6Gb/s USB 3.0 HDMI ATX


Looks great.

I've got a ma785td-v evo that does 300MHz so you should be easy at 13 x 250MHz - just drop your memory ratio a notch.
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October 5, 2010 2:14:51 PM

Plus video and photo editing *is* where you would want the cache...
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October 5, 2010 8:22:28 PM

Right now the whole build is a "Wish List" but I will probably pull the trigger on it. I've built a couple of systems for friends, non-gaming, general purpose rigs--but I want to build something for myself!

Any advantage to go with the AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core for $139 or could I get the 810 to approach it's performance for $25 less? I know one can play the "just a little bit more" game forever and if the 810 will serve my purposes that's fine.

This would be my first foray into the mystical world of OCing so I know nothing! Well, let me take that back. I know enough to ask questions and ask for advice from these forums before I do anything stupid!
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October 6, 2010 6:01:08 AM

Wisecracker said:
Looks great.

I've got a ma785td-v evo that does 300MHz so you should be easy at 13 x 250MHz - just drop your memory ratio a notch.

When you say drop the memory ratio a notch what exactly does that mean?
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October 6, 2010 2:02:54 PM

highcountryrider said:
When you say drop the memory ratio a notch what exactly does that mean?


Overclocking is a 'balancing' act. You want to increase performance and maintain system stability. By overclocking the CPU you do not want to stress other system components. There is an inter-relationship between the components.

When you increase the system 'clock' to boost the CPU you are also increasing the RAM speed. The simple workaround is to drop the memory ratio --- and when the system clock is raised to boost the CPU speed, the RAM is increased in speed and returns to 'spec'. It works like this ....

With AMD your RAMs speed is 'double-pumped'. DDR3 1333 is 667MHz x 2. DDR3 1600 is 800MHz x 2. DDR3 1066 is 533MHz x 2, etc. ....

There is a single setting in the BIOS which allows you to set the memory ratio. If you purchase DDR3 1333, simply drop the memory ratio from 667MHz to 533MHz, and up the system clock to 250MHz.

End result: You have increased your CPU in speed 25% and returned your RAMs speed to spec 1333MHz

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October 6, 2010 8:19:35 PM

Thanks for the clear explanation. I will probably (no, make that certainly!) be a frequent visitor to these boards after I get the build done and am ready to try some over-clocking.
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October 8, 2010 2:55:37 PM

Best answer selected by highcountryrider.
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