New Build Gaming Monster

Total overkill. Those are dual-slot video cards, and the motherboard doesn't have the pci-express slots spaced right to fit 4 of them. 2 hd 7970s should be plenty for a single 1920x1080 monitor at 120hz. Most games won't benefit from more than 8 GB of memory, an SSD makes a 10k rpm hdd pointless, and are you sure you need a sound card (instead of onboard audio) and 2 optical drives?

I guess you're an audiophile then. That's okay, now that you've trimmed the build down to 2 video cards so that you'll actually have room for the audio card.



SSDs have no moving parts, so latency is much lower. They don't need to be defragged, and generally have better performance than even 15k rpm hdds. You can google "SSD vs. HDD" for lists of additional differences. It's generally considered better to get a small to medium sized SSD for the OS and games, and add a large inexpensive HDD (5400 or 7200 rpm) for files that need the higher capacity but don't benefit so much from the SSD speed.

Now, to evaluate the parts you chose more carefully:

CPU: AMD FX-8350 4.0GHz 8-Core Processor ($179.99 @ Newegg)

Seems like a good choice, unless you play games that favor Intel cpus, such as Skyrim.

CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($99.99 @ Newegg)

That is a popular choice, but I hope you realize that sealed loop coolers only give 5-10% better cooling than high-end air coolers like the Noctua NH-D14, and aren't really much quieter. Admittedly, they circumvent the need for low-profile memory.

Motherboard: ASRock 990FX Extreme9 ATX AM3+ Motherboard ($159.99 @ Newegg)

I don't know whether there are better motherboards you could choose, but ASRock tends to be good value for the money.

Memory: G.Skill Trident X Series 16GB (4 x 4GB) DDR3-2600 Memory ($329.99 @ Newegg)

Higher bandwidth won't give you significant benefits over DDR3-1600 in games or applications even with an FX chip, looking at http://www.tomshardware.com/reviews/bulldozer-ddr3-overclocking,3209-11.html

Storage: Western Digital VelociRaptor 1TB 3.5" 10000RPM Internal Hard Drive ($219.98 @ SuperBiiz)

See my suggestions above about getting an SSD and a moderate-rpm hard drive

Video Card: Sapphire Radeon HD 7970 GHz Edition 6GB Video Card (2-Way CrossFire) ($606.13 @ Newegg)
Video Card: Sapphire Radeon HD 7970 GHz Edition 6GB Video Card (2-Way CrossFire) ($606.13 @ Newegg)

Looking at benchmarks for Crysis 3, I have to rescind my statement about 2 of these being plenty for 1920x1080 at 120hz. I found http://www.brightsideofnews.com/news/2013/2/21/geforce-gtx-titan-sli-review-crysis-3-and-battlefield-3-vs-hd-7970-ghz-edition.aspx which shows a pair of 7970s averaging 47.25 fps at max settings. Even 3 GTX Titans can only average 64.64 fps there. I can't find good comparisons of 2 gtx 690s or 2 hd 7990s to 3 GTX Titans.

Sound Card: Asus Xonar Essence STX 24-bit 192 KHz Sound Card ($187.98 @ SuperBiiz)

Personally, I'm not enough of an audiophile to bother with a discrete soundcard, but I think the Asus Xonar series is generally considered excellent quality.

Case: NZXT Switch 810 (White) ATX Full Tower Case ($161.86 @ TigerDirect)

Should be ok.

Power Supply: Corsair Professional 1050W 80 PLUS Silver Certified ATX12V / EPS12V Power Supply ($189.99 @ Amazon)

Good brand.

Optical Drive: Pioneer BDR-2208 Blu-Ray/DVD/CD Writer ($79.99 @ Newegg)
Optical Drive: Pioneer BDR-2208 Blu-Ray/DVD/CD Writer ($79.99 @ Newegg)

Why do you need two optical drives?

Operating System: Microsoft Windows 8 Full (64-bit) ($99.99 @ Newegg)
Monitor: Samsung S27A750D 27.0" Monitor ($599.99 @ Amazon)
Keyboard: Corsair Vengeance K90 Wired Gaming Keyboard ($125.00 @ Mechanical Keyboards)
Mouse: Cyborg M.M.O.7 Wired Laser Mouse ($128.98 @ Newegg)

These seem ok (even if I wouldn't bother with a mechanical keyboard or laser mouse for myself, that's somewhat a matter of taste)

Speakers: Logitech Z906 500W 5.1ch Speakers ($309.99 @ SuperBiiz)

500 watt speakers? Try not to rupture your eardrums or make your neighbors call the police on you.