Compaq pro 6300 CPU upgrade

[Jailbreakius]

I recently purchased a Compaq pro 6300 SFF and would like to upgrade the CPU to a xeon e3-1270, however it does not state in the manual if it is compatibile or not because it does not have a xeon section. I am guessing because it does not have it listed it means it is not compatible however i would like to make sure before i buy an i7 3770. I would perfer the xeon because i will be using this as a server for games.

[SDH]

We have some of those.... my advice:  Find the latest QuickSpecs for that and you'll find that the fastest processor you can run is:

Intel® Core™ i7-3770 Processor (this one is what you want, for sure, and the same one can be used as the top processor in the Elite 8300)
Up to 3.9 GHz Max. Turbo Frequency (3.4 GHz base frequency)
8 MB cache, 4 cores, 8 threads
Intel HD Graphics 4000
Supports DDR3 memory up to 1600 MT/s data rate.   Do your research on the correct memory. and I got excellent pricing used off eBay for these nice little boxes.  You cannot put just any processor in.  There is a BIOS white list.

Get identical sticks of HP approved memory to fill all slots.  That can take one SATA III SSD... the 8300 can take two.  Don't run the processor based graphics..... use a nice fast small form factor video card.  A Quadro K600 SFF card is nice and very reasonably priced used off eBay if you are on a tight budget.  Otherwise get the Quadro K620 for roughly 65.00 USD from eBay.  Make sure to get one with the shorter metal backplane bracket because that box cannot take the full height bracket.  That K620 is my favorite for these SFF workstations.  My recall is that you can turn off the processor-based graphics in BIOS. 

Run latest BIOS.  Update BIOS from within BIOS.... never from within W10 IMHO due to a number of bricking reports from doing that.  You can risk a BIOS update from within W7 if you like to take small chances.  My one and only HP workstation BIOS brick came from running the HP in-OS BIOS updater from within W10.....