i suppose the PSU at this point is the most likely culprit just being too low, but the firewire port is only taking a PCI slot for the power.
i still have to plug in the wifi card after the graphics card, and then another side fan. at the moment, 5 fans are being powered, and they can't exceed a certain amount of wattage, i would think.
but i'm not planning on putting anything else on the thing. maybe there are too many fans for it?
The PSU is fine. The steam machine beta box was running almost the same stuff on 100 watts less.
PCPartPicker part list: http://pcpartpicker.com/p/2mxQ1
Price breakdown by merchant: http://pcpartpicker.com/p/2mxQ1/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2mxQ1/benchmarks/
CPU: Intel Core i5-4570 3.2GHz Quad-Core Processor ($192.99 @ NCIX US)
CPU Cooler: Zalman CNPS2X CPU Cooler ($23.99 @ Newegg)
Motherboard: ASRock Z87E-ITX Mini ITX LGA1150 Motherboard ($129.99 @ Microcenter)
Memory: Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600 Memory ($76.24 @ Amazon)
Memory: Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600 Memory ($76.24 @ Amazon)
Storage: Seagate 1TB 2.5" 5400RPM Hybrid Internal Hard Drive ($99.00 @ B&H)
Video Card: Zotac GeForce GTX 780 3GB Video Card ($531.98 @ SuperBiiz)
Case: Silverstone ML04B HTPC Case ($74.99 @ Amazon)
Power Supply: Silverstone Strider Gold 450W 80+ Gold Certified Fully-Modular SFX Power Supply ($94.99 @ Amazon)
Other: Silverstone Technology RC01 PCI Express Riser Card ($50.53)
Total: $1350.94
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-22 03:07 EST-0500)
If the PSU was the problem you would just get a black screen. Plus your GPU is not even going into full load so there's zero chance it's sucking up all the power.