The e2200 will work for sure. Someone in anandtech's for sale/trade section has an e4300 for only $40 shipped that will also work. Your old dell heatsink should be adequate. Another person has the e6550 for $65, but it's too new to work with your motherboard bios; same for the e5200. Use core2 duo; always better than the old p4 cpus.
I had an e4300 pin modded to run at 1066 (2400 overclocked). It worked fine on my hp motherboard. Pin modded cpus are nice as they don't effect the memory settings. But the same cpu wouldn't even post on my asrock boards. But the copper tape is easy to remove; just scrape it off with a knife. If you want to learn more, just type "pin mod" with your favorite search engine. The copper tape is at some Fry's locations for $2.99.
well I am sort of hurry on this matter, decide in a day or two
my available options are:
from Dual Core
and from Core 2 Duo
I did'nt find much help from Dell online docs on their site. except tech specs for DELL Optiplex 745
tech specs shows under 'processor'
-Intel® Core™ 2 Duo 1066MHz FSB Socket T with Dual Core technology XD, EM64T, 2MB and up to 4MB L2 cache, and EIST3
My options for E6000 series here:
Core 2 Duo E6550 SLA9X (G0) 2333 MHz 4 MB 1333 MT/s 7x 0.962 - 1.350 V 65 W LGA775
Core 2 Duo E6750 SLA9V (G0) 2667 MHz 4 MB 1333 MT/s 8x 0.962 - 1.350 V 65 W LGA775
--->Please note that in Dell specs mentioned in with Core 2 Duo option, 1066MHz FSB, while my both choices have 1333 MT/s.
it means to me CPU FSB rating is higher then Motherboard, so does that matter?
--->WILL E6550 OR E6750 WORK IN MY SYSTEM? HOW I VERIFY , these are boxed, seller is not responsible if they work or not after I purchase. No option to test first then purchase in this case.
and about E2200, E5200, they belong to Dual Core family, which is not mentioned in DELL specs, as u said quite sure they will work ( E2200 )
How do I confirm my BIOS/system will support these upgrades. MOBO is DELL part no. Chipset is Q946.
I think DELL does'nt allow any option for overclocking so that is out of consideration.
Only the 800 or 1066 core2 duo cpus will work with your dell. The 6550 and 6750 are 1333 fsb, so you can't use either one. You can also check ewiz (superbiz) and starmicro for cpu deals. I would recommend the e4600 for $93 at starmicro. And the copper tape pin mod can be used on many boards without changing any of the board bios settings. On my hp board, the e4300 booted up at 1066 every time, and cpu-z confirmed the settings. Remember also that if your board has it, eist (speed step) will automatically run your cpu at a lower setting whenever possible to save energy (dropping the cpu multiplier to 6.0) until you do some gaming or other processes that require full power. Speed step is Intel software built into the board bios, but can be disabled if you want. I recommend you use it. It works almost flawlessly.
Are you all sure the E5200 will not work in the 745? I had a new 760 die and I was able to keep the CPU (E5200). This chip is 800 fsb and figured it would work but I don't want to kill my 745 tower buy installing it. I enjoy the fact that I can run a 9800GT (eco), 4Gb of RAM, and two 74GB Dell Raptors in RAID on this box but the Pentium D945 is killing me.