Jan 12, 2012 - It's possible that there will be a BIOS update for your Asus m/board. Could corrupt your BIOS software and render your motherboard useless. Oct 15, 2016 - Hi @Mac-Roe. Welcome to the HP Support Forums. It is a great place to find the help you need, from other users, HP experts, and other.

I'm interested in upgrading the CPU on my wife's desktop computer, which is an HP Pavilion a747c with a product number PJ514AA (circa 2004/05). This computer has an OEM-spec motherboard (ASUS model: PTGD1-LA; HP/Compaq name: Grouper-UL8E). Specs for the computer and motherboard are listed on the following URLs: Computer: Motherboard: According to the spec sheets, the base CPU is an Intel Pentium 4 520 (2.8 GHz), 800 MHz front side bus, Socket 775, Hyper Threading technology, and the motherboard supports Intel Pentium 4 HT processors that fit Socket LGA775 up to 3.4 GHz. I've found a couple of potential upgrade options for the 3.4 GHz speed, but one of the options (Pentium 4 551, $286) is much more expensive than the other (Pentium 4 640, Prescott core, $100).

The only difference between the two processors appears to be the amount of L2 cache. For some reason, the 551 chip has only 1 MB of L2 cache, but is almost three times as expensive as the 640 chip with 2 MB of L2 cache. Generic serial remember to change idvendor.

(My current CPU, the 520 chip, has only 1 MB of L2 cache.) So here are my questions: 1) Will both of these chips work as an upgrade on this particular motherboard? 2) If so, which one would perform better?

I'm tempted to go with the 650 chip (2MB L2 cache @ only $100), assuming bigger is usually better, especially since it's cheaper, but I want to make sure that this CPU is actually compatible with my system. TIA for your feedback.

Hello and welcome to the TSF. According to the specs you listed it should support either cpu, however the 650 is a slightly cooler runing cpu than the 551 and the 650 will support a 64bit OS while the 551 will not. But, you may need a bios update from HP to support the 6XX cpu's and I'm not sure if HP ever bothered to update that far ahead.In reality however there is no major performance gains going from a 520 to a 551 or 650 (maybe 5% or so) I'd say you're probably better off adding more memory by replacing the 2 X 256 modules you have now with 2 X 1Gb from Crucial, Corsair or Mushkin (use their memory advisors for compatible memory). Quote: Release Date: 2006-05-10 Version: 3.28 Description PTGD-LA/PTGD1-LA/PTGD2-LA Motherboard BIOS update resolves boot issue when HP Photosmart 8250 printer is connected. Fixes # Resolves boot issue when HP Photosmart 8250 printer is connected. # Resolves intermittent issue with resuming from suspend mode.

# Updates processor microcode to support newer Intel CPUs. Operating System: Microsoft Windows XP Home Microsoft Windows XP Media Center Edition Microsoft Windows XP Professional Do you know if Intel released the 650 processor prior to May 2006? BTW, why can I only expect a 5% performance gain when going from 2.8 GHz to 3.4 GHz? (3.4 / 2.8 = 121%, so I thought I might get a more noticeable improvement.) FWIW, I'm installing a new graphics card, too (EVGA GeForce 8600 GT), which I will be using to drive a HD monitor via the DVI port. That's why I'm thinking about upgrading the CPU in addition to the RAM.

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