Upgrading three systems - what info to gather?

[keymoo]

I'm upgrading the graphics cards of three of my kids' PCs to an R9 380. I want to do an inventory of their hardware and run a benchmark test before I install the new cards at Christmas. What information do I need to gather and what is the easiest way to do this without having to open them up?

I'm guessing

• PSU Output
• Motherboard make and model
• Compatibility with case (does it fit)

As I write this I'm beginning to realise I might need to open them up. I would also be interested in

• CPU make, model
• Amount of RAM (I think they're all 8GB)

From a performance point of view I would like to measure current system and graphics card performance before and after installing the cards in each PC. Any tips?

 

[keymoo]

OK so the specs of all three systems are:

System 1
PSU: Corsair 430W V2 CX Series PSU
Mobo: Gigabyte F2A75M-DS2 AMD A75 Chipset (Socket FM2) DDR3 Micro ATX Motherboard
Processor: AMD A10-5800K Black Edition 3.80GHz (Socket FM2) APU Trinity Quad Core Processor
Memory: TeamGroup Xtreem LV 8GB (2x4GB) DDR3 PC3-21300C11 2666MHz Dual Channel Kit
GPU: MSI HD 6670 2048MB GDDR3 PCI-Express Graphics Card
Case: Xigmatek Asgard Pro Gaming Case
OS: Windows 7
Valley benchmark: FPS: 8.9 Score: 373 (1080p on Ultra)

System 2
PSU: Corsair 430W V2 CX Series PSU
Mobo: Asrock A75M-HVS P1.80
Processor: AMD Llano A6-3650 2.60GHz Socket FM1
Memory: Corsair Vengeance 8GB (2x4GB) DDR3 1866Mhz Memory Kit CL9 1.5V
GPU: NVIDIA GeForce GTS 250 (1024MB)
Case: Casecom CB-191 Black Mid Tower Case
OS: Windows 8.1
Valley Benchmark: FPS: 12.8 Score: 535 (1080p on Ultra)

System 3
PSU: OCZ CoreXtreme CXS500W
Mobo: Asrock FM2A75M-DGS P2.60
Processor: AMD A10-5800K Black Edition 3.80GHz (Socket FM2) APU Trinity Quad Core Processor
Memory: DDR3-1333 in BIOS (Patriot Viper "Black Mamba" Generation 3 8GB (2x4GB) DDR3 PC3-17000C11 2133MHz Dual Channel Kit)
GPU: AMD Radeon HD 7660D + HD 6670 Dual Graphics (2048MB)
Case: Fractal Design Define Mini Series Micro ATX Case - Black Pearl
OS: Windows 10
Valley Benchmark: FPS: 16.2 Score: 680 (1080p on Ultra)

I've ordered three of these: RADEON R9 380 "DD DUAL FAN" 4096MB, one to go in each system. I'm going to replace the case on System 2 also. Do you think they will be compatible?