I Have an HP H8-1214 that came with an FX-6100 processor, 12gigs of ram and a 1.5 tbyte hard drive. I replaced the six core processor with an FX-8370 8 core, the hard drive with a Samsung 850 EVO SSD, the stock 300 watt power supply with a Seasonic 550 watt gold, and removed the 12 gigs of ram and replaced it with 16 gigs. The only thing left that I wanted to do was to remove the stock HP (AMD HD-7450 1gig DDR-3) graphic card, and replace it with a decent 4 gig DDR-5 at a reasonable price. After buying and returning 5 different graphic cards (2 Nvidia's, and 3 AMD's), I finally found out that all of the prior 5 video cards were made to operate properly only on motherboards with a UEFI bios. My computer came with Windows 7, and I found out after some digging that somewhere in the middle of the peak of computers built with Windows 7 the manufacturers decided to change from legacy bios to UEFI in preparation for the upcoming Windows 8. In fact the span of similar HP model computers that use the same mother board as mine came with several versions of the same mother board depending on which version of windows it had installed in it from the factory. Earlier ones , like mine with windows 7 home had a legacy bios, while a very similar model with Windows 7 Pro also came with the same motherboard with a legacy bios but in a different version so that it would support up to 32 gigs of ram., while an even later version of the same motherboard designed for Windows 8 came with the newer UEFI bios. Even after talking to HP several times, and a few reputable computer techs, all telling me that my computer was to new to have a Legacy bios, I went out on a limb and bought a 6th graphics card. This one was the Sapphire Radeon NITRO R9 380X 4GB DL-DVI-I/DL-DVI-D/HDMI/ DP Dual-X OC Graphics Card with a little switch on the side that allows you to change it from UEFI to Legacy bios. It came from the factory set on UEFI, and I tried it with no luck, then switched it to legacy, rebooted and presto, it worked great ! It just barely fit in my stock HP case, but that's what I wanted. I liked the looks of the case and just wanted everything to fit. I ended up the whole project by replacing the stock CPU cooler with an ARCTIC Freezer Xtreme Rev. 2 - 160 Watts Twin-Tower Heatsink CPU Cooler (which also just barely fit), but is virtually silent, along with the graphics card. Hope that helps you. You can do anything you like if your creative and put your mind to it !!! Dan