Will this CPU work in my system?

April 15, 2011 at 15:48:50
Specs: Windows XP
Hi everyone.

I currently have a ThinkCentre M55-8810-BQ4 desktop (specs here: http://www-307.ibm.com/pc/support/s... I recently started doing a lot of HD video encoding, and my Pentium D 945 (3.4GHz) isn't cutting it. Its taking me 10 hours plus to encode an hours worth of 1080p video.

I want to upgrade to a quad-core, and am planning on going with the Intel Core 2 Quad Q8400 Yorkfield 2.66GHz.

I don't have any experience working with CPUs before; I have done things like installing memory, video cards, hard drives/disk drives, etc. I would just like to make sure before I order this CPU that should work. They both have the same socket type (LGA775) - but is there anything else I need to check? Also, I assume it will just be a drop-in replacement; is that right? Anything I'm missing here? Thank you all!!

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April 15, 2011 at 16:50:38
It's not the CPU support list. Here's the corrected link:


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April 15, 2011 at 16:57:01
It would help for us to know that you already posted on another forum. It would help to know what you already found out about your motherboard.
If your board is limited to 1066FSB then you should shoot for that, even if it means going with the fastest dual core your system can run. Look at:
BUT I would make sure that your board actually supports the core2 series processors, and that means contacting the manufacturer if their posted literature is minimal. The Core 2 series CPU will be better due to the faster FSB and other newer technologies. Look at:
Look at the 'performance' tab for for bench test comparisons, the specifications tab for the numbers.

You have to be a little bit crazy to keep you from going insane.

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April 15, 2011 at 17:10:42
Thanks Fingers. I posted the link to the manf website, which has the motherboard specs I discovered. Maybe you didn't see it in my post.

Thanks mickliq - I did see that in the documentation. I was asking on the assumption that it was possible that the list only includes CPUs which were offered as options with this system when buying it from Lenovo, and there were other CPUs not offered as options which could be compatible. Same thing with the FSB - that even though 533/800/1033 speeds are listed, that could be because 1333 CPUs weren't an option with the system, but were still theoretically compatible.

I also have since discovered this post (http://communities.intel.com/thread/15267) which appears to indicate that even if my mobo doesn't support 1333, that the CPU can adjust to compensate.

If anyone can confirm what the above indicates, or has any other pertinent new info/insights to add, would love to hear from you. Thanks!

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April 16, 2011 at 06:43:24
"if my mobo doesn't support 1333, that the CPU can adjust to compensate"

If by compensate you mean it will run 20% slower than it's rated speed, then you're probably correct. The Q8400 is designed to run at 2.66GHz (8 x 333MHz at 1333MHz FSB). If you put it in a board that only supports 1066MHz FSB, it will run at 2.13GHz (8 x 266MHz) IF it runs at all. Since your board isn't meant for 1333MHz FSB CPUs, the CPU data won't be included in the BIOS code, so it's very possible it won't work - at the very least, it won't be properly identified. I suggest you stay with the manufacturer's recommendations.

• Intel® Celeron® D Processor 336
• Intel® Celeron® D Processor 341
• Intel® Celeron® D Processor 346
• Intel® Celeron® D Processor 351
• Intel® Celeron® D Processor 352
• Intel® Celeron® D Processor 356
• Intel® Pentium® D Processor 805
• Intel® Pentium® D Processor 820
• Intel® Pentium® D Processor 915
• Intel® Pentium® D Processor 945
• Intel® Core™ 2 Duo Processor E6300
• Intel® Core™ 2 Duo Processor E6400
• Intel® Core™ 2 Duo Processor E6600

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April 16, 2011 at 19:51:59
I gave you a link to a comparison with the E7600 above, but here is the same thing with the E6600 which is listed:
If you look only at the CPU speed, you would think it would be slower, BUT if you look at the Performance tab, you will see that in bench tests it is significantly better than you CPU. The E7600 is still better, but it is not listed being a newer CPU so there is no guaranty that it will work if not listed (your risk then).

You have to be a little bit crazy to keep you from going insane.

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