Hi, I own a Dell Optiplex 745 Desktop and I want to upgrade from the Pentium D inside of it right now. I was wondering if this CPU would be compatible with my hardware: http://www.amazon.com/Intel-Q6600-Quad-Core-Processor-C... If not are there any other Quad-cores that will work with my machine? At very least I would prefer a Core 2 Duo. Here are my Processor Specs (Sorry for the Extra Info.) Number of cores 2 (max 2)
Number of threads 2 (max 2)
Name Intel Pentium D 925
Specification Intel(R) Pentium(R) D CPU 3.00GHz
Package (platform ID) Socket 775 LGA (0x2)
Extended CPUID F.6
Core Stepping D0
Technology 65 nm
Core Speed 2396.5 MHz
Multiplier x FSB 12.0 x 199.7 MHz
Rated Bus speed 798.8 MHz
Stock frequency 3000 MHz
Instructions sets MMX, SSE, SSE2, SSE3, EM64T
L1 Data cache 2 x 16 KBytes, 8-way set associative, 64-byte line size
Trace cache 2 x 12 Kuops, 8-way set associative
L2 cache 2 x 2048 KBytes, 8-way set associative, 64-byte line size
FID/VID Control yes
FID range 14.0x - 15.0x
VID range 1.116 V - 1.324 V
We would need your motherboard model to give you a good answer. Google and download a program called, CPU-Z and see what it reports as your motherboard model. Alternatively, you can open up your case and look for a model number.
The problem is that the LGA 775 socket was used for so long, 4-5 years, and includes everything from Pentium 4 90nm chips all the way up through the Q9000 series Core 2 Quads. Many of the early boards supporting P4 and P4D boards don't support Core 2, or Core 2 Quad chips. Some support only early Core 2 chips, and other later run stuff supports it all.
The good news is that Dell kept updating your BIOS through 2010...see here...
Found that, the best you can do according to it is the E6000 series of Core 2 chips, which should also include the Q6600 or Q6700. Newer 45nm chips from the E/Q8000 or 9000 series will not work. So, to answer your original question yes, the Q6600 will work fine.
Be aware that when adding a GPU you'll need to upgrade your power supply as well. Even the tower model (not sure which you have of the four listed), only has 305W PSU. You'll need a 400-500W PSU to run a decent graphics card.
Yea I know, it would be nice if Dell made their machines halfway customizable. A couple GPUs should work though, I believe (Not really high quality ones)
You would probably be okay with some of the PCIe slot powered GPUs like the HD 6670, or 7670. The saving grace is that Dell PSU's are typically pretty decent and underated in regards to wattage. But if you figure it's good for 350W (rated 305W), then the spec sheet said something like 75% efficiency, which knocks it down to 250W or so, and further consider that not all of that is on the same voltage rail then it really is cutting it close with the stock PSU. Under full load the GPU and CPU could be pulling in a combined 175W+, add in other system components and it would tight. Unfortunately those machines are office grade and just weren't meant for any sort of heavy lifting.
To end any confusion with the upgrading of a dell optiplex 745 i want to just post that i currently own one with a q6600 cpu and a HiS radeon hd 7770 using a sata to 6pin pci adapter 1x pci wifi card 1x bluray/dvd burner 1x 750gb hdd 7200 rpm 1x 250gb hdd 7200 rpm all on a stock 305 watt psu and it runs fine and has never crashed or slowed down or anything