I bought the Dell Precision 690 from a guy on craigslist because the specs were crazy high, he offered me the t3500 for $50 more with the 690 and I stupidly without research said no. I spent 3 weeks upgrading the 690 then realized the t3500 was a way better computer. The thing that made me get it from him was it took both standard ddr 3 ram and ecc server ram! I had a bunch of 2gb sticks and a few 4gb sticks laying around. They didn't exactly match timing and everything but I figured I'd try it. The 690 was a dual core 3ghz system with 2 physical processors, so basically it was a quad core system, it came with 8 sticks of ddr 2 667 mhz quad channel ram, and a small 250gb hard drive. I upgraded the hard drive to an SSD 256gb drive and a radeon r9 270 2gb pci-e graphics card. It was a beast machine no doubt but I noticed somegames, I had to turn settings down or it would have these microfreezes. It played crysis 3 with no problem except frames dropped during certain scenes. I had to trade the guy the SSD and $30 but he gave me the t3500 with a crappy 128mb pci-e graphics card and 2 1tb hard drives. The hard drives were from last year and had 64mb cache and my biggest sata hard drive only had 32mb and my others were 8mb. The only problem I ran the system in raid O and windows 7 refused to install on it, I wanted the added bonus of raid so windows 8.1 is what I chose. I know most of you hate it, I'm getting used to it. Here's the specs now
T3500 3.06ghz quad with hyperthreading making it basically an 8 core system, 14gb of ddr 3 ram, Radeon R9 270 2gb pci-e graphics card, 2tb of raid 0, 1tb extra storage and 500gb extra storage, and a brand new intel pci-e 1x wireless network card, oh and a dvd burner drive since the drive in here was only a dvd drive.