No, it's impossible on most OEM computers.
dell optiplex gx620
The Dell Optiplex GX620 SFF uses an F8101/0F8101 type motherboard.
The reviews for a Dell Optiplex GX620 are all good. It is designed for people who want to become enterprising on the internet. They are reliable, flexable and dependable.
The dimensions of the Dell Optiplex GX620 are 12.4" x 3.6" x 13.4". It is a small or regular sized laptop. There are other choices that are larger or smaller.
There are new Dell GX620 motherboards listed on Ebay from 24.95 while Amazon has several used GX620's that are much higher in cost, around 75 dollars.
Dell optiplex 755 is newer Between the gx620 & the 755 there was : the gx620 then optiplex 320 optiplex 745 optiplex 330 optiplex 360 optiplex 740 then the 755 Also, the newest optiplex is 9010
Dell's Optiplex GX620 is sold by a variety of retailers online including Sears and Overstock. It can also be purchased from the store of retailers near you.
It depends on what you mean by old. An old Dell desktop from way back in 2011 can probably be easily overclocked, but a recent Dell desktop from 2004 might be impossible to overclock.
The Dell Optiplex GX620 is no longer available to purchase new through Dell. Other models still available range in price from $325 to over $1200 depending on which model and personal customizing. There may be used or refurbished models available on websites or local classifieds starting between about $120 to $158.
If you are not planning to overclock, it should be.
Dell. They offer all kinds of computers that has PotiPlex. From desk tops to netbooks and in between. You can either order your Dell form their website or you can go to a dealer in your home town.
One can purchase a Dell PowerEdge 2850 in many different places. Some places that sell it are eBay, Amazon, Dell official web page, PCMag and Overclock.