I've had two towers in the past 8 years.
I had been running SLI builds since I got into actual PC gaming, starting with 7600 GT. I was blown away by how well they ran Oblivion - cranked up those settings and I was off! Too bad I found the game itself to be bland and horribly boring. Anyway.....
I purchased a new tower to use - Cooler Master Cosmos 1000!
I finally decided to pull the trigger when I found a heck of a deal on 2 brand new GTX 280s - they were at EOL, replaced by the GTX 275 and surpassed by the GTX 285 - in March of 2010 to go with the new tower I had purchased. I think I spent around $200 on each card, brand new in box from Tigerdirect.
I then procured a CPU (Phenom II x4 940) and MB (ASRock K10N780SLIX3-Wifi) and eventually a new PSU (CoolerMaster SilentPro 1000W) and RAM (Corsair XSM2 2x2GB DDR2 800). By the first week of April 2010 I had everything I needed for my new build (step up from the Athlon X2 64 5200+, 4GB DDR, 2 7600 GT in SLI). I get everything installed and work in installing Vista (I know, 7 was out, but I already had Vista OEM from a computer class I was taking). Everytime I installed a GPU driver, the system would lock up or BSOD. I installed XP - same thing. I installed one of my 7600GT cards in Vista and XP as well, same thing. 8 different OS installs over the course of 2 nights......I worked with ASRock customer service via emails and did a few things that I had not thought of, but still the same issue. ASRock said to RMA the board. RMA with newegg and about 10 days later a new MB arrived. Install everything and no issues!
Fast forward about 3 months later and end of July I had sent in one of my GTX 280s to BFG due to faulty fan. They sent back a GTX 285. When I received the GTX 285 BFG announced they're closing doors and no longer taking anymore RMAs. That's cool. I got my replacement card, though I'm a bit said it's a GTX 285 - can't run SLI. Oh well. GTX 285 is faster than a single 280, so I'll make due. Or so I thought.....
GTX 285 gets constant driver crashes. Increasing voltage and dropping clocks didn't fix it. So now I have a faulty 285 that I can't return due to the manufacturer having closed....I spent a good 4 hours searching online if anyone had flashed a 280 BIOS to a 285, but I came across nothing useful. Every post I came across basically said it wouldn't work due to the difference between the cards. I had nothing to lose, so I tried it anyway. Success! It worked. I ran the 280 and flashed 285 in SLI for a couple of years. I actually found a pic of the build:
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I last tested the CPU/MB/RAM and GPUs about 20 months ago and they all worked. I have since donated them to the Memorial to Kreij old school build - which will eventually happen, I think.
I eventually moved from the GTX 280s to 2 GTX 570s in mid 2012. Everything else stayed the same. I kept that setup until January of 2014. I moved to my current i5-4670k. Once I moved up from my OC'ed PII x4 940 (ran her at 3.6) to the i5, it was like a whole new system. Frame rates nearly doubled with my 570s in SLI. I ran those cards until July 2015 when I picked up a GTX 980Ti AMP! Omega.
Before the move to the 980Ti I got a new case, Fractal Design Arc XL.
I wasn't content with the basic black/white look of it. I wanted something that had more pop to the color. I spent a good bit of time sanding, priming and painting for this end result:
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I had the i5 and GTX 570s in that case for a few months (though I haven't been able to track down a pic of it). I got the 980Ti and soon after a new 850W Seasonic 80 Gold PSU.
Here's the i5-4670K, 8GB DDR3 ADATA RAM (8GB more was added a short while later. Also, they're gold! One of the reasons I picked the yellow color for the case), the 980Ti - but before the new PSU:
That's what I've been using since July 2015. I did pick up a second 980Ti AMP! Omega that I ran in SLI for about 6 months, but I ended up moving it to the HTPC to be a second gaming computer, along with a Plex server. Kids can play games on that one and stay the hell off my computer.
I did have to get a new MB since the ASRock one (see in pic above) died on me. Eventually ended up with an ASUS Z97-AR.