Optiplex 745 Small Form Factor Upgrade

[polis_putrus]

Hello, Im planning on upgrading my Optiplex 745 Small Form Factor pc

PLEASE go here help me answer my questions https://www.dell.com/community/Optiplex/Optiplex-745-Small-Form-Factor-Upgrade/td-p/6087612 THANKS FOR ALL HELP

SPECS:
Core 2 Duo E6400 2.13Ghz Socket LGA 775
7GB RAM 3x2GB 1x1GB DDR2
275w Power Supply (Not Upgradeable)
80GB Western Digital Harddrive
+ to save power I disconnected the cd drive
(I have the latest bios version 2.6.6)

UPGRADE:
Core 2 Quad Q6700 2.66Ghz Socket LGA 775 $16.99 - ebay
1,000Gb Hard Drive $45.99 - ebay
AMD Radeon R5 240 1Gb Low profile Graphics $24.90 - ebay ( or should I get R7 240 )

Before I buy I was wondering if the new cpu WITH the graphics card will work, I do know the cpu will work without the graphics card and I do know the graphics card will work with the original cpu BUT im not sure what will happen when I get both the new cpu and the new graphics card (Please let me know if the cpu will overheat or not), will it go over 275w on the power supply. I might also throw away all my old ram and buy new 8GB RAM because ever since I upgraded the RAM from 3GB to 7GB it does blue screen after 30-60min of use: paged_fault_in_non_paged_area there are more errors than this but this is most common.

NOTE: I went to coolermaster.com (psu calculator) and put all my UPGRADED pc specs and it says load wattage: 276w 😀lol 1 watt over, is this ok (I actually put, for the graphics card r7 240, as there was no r5 240, they do use the same watts though)

Please let me know if this upgrade plan will work, I am going to be gaming, BUT not on highest settings medium to low 1280x720 I will be playing Grand Theft Auto V, Call of Duty 2, Minecraft, Far Cry 1 and 2, Left 4 Dead 1 and 2, Battlefield 2, Counter Strike: Source, Counter Strike: Global Offensive, Just Cause 1 and 2, Mercenaries 2 World in Flames, Grand Theft Auto: San Andreas, and 10-20 more. (This is why I need 1000GB harddrive)

Thanks For Any Help.

 

[polis_putrus]

Q6700 IS the better choice. You won't need to underclock. I'm just showing you where to look and what to look for in the future. Just making you aware that there can be more than one version of each CPU, and showing you how to find the better versions.

I will not be underclocking anymore Ive changed my mind I will get a PNY Geforce GT 710 2GB Low Profile, with this graphics card it uses less power than the R5 240. at ( coolermaster.com/power-supply-calculator ) I calculated my specs:Core 2 quad q6700 and Geforce 710 and it said load wattage: 265w but with Core 2 quad q6700 and R7 240 (I chose R7 240 instead of R5 240 because there was no option for R5 + they use same ammout of wattage) it said load wattage: 276w so I will be getting Geforce 710 instead since it uses less power remember, my psu is 275w + it is 2GB and there was no R5 240 2GB that would fit
Please let me know if Geforce 710 will work.

Any of those low end GPU's are terrible in game play if they will run them at all, especially with the newer games.

Combine that with the outdated rest of the system and you are in for a hard road.

R7 240 is actually pretty good even R5 240 is, I dont know what your talking about take a look
( https://www.youtube.com/watch?v=63RW8IVn-mE ) let me know what you think.