fullmetall :
Well mentioning it only has 1 pci-e cable and the 4870 1gb supports 2 pci-e connectors to run, no, it wont work.
550w would be the minimum for that card for me, 650tx would be the max psu i would put on 1 of those cards.
Damn - thank you! You've saved my Saturday!
Going to double check now that I've made one n00b mistake ... will this do the trick?
(If it matters my case is a Coolermaster Centurion 5.)
Hi-Power Black 800W 14cm Blue LED Fan PSU - 20+4pin 4x SATA 4x PCI-E
* 20+4pin Motherboard Power Connector
* 4+4pin ATX 12V Motherboard Connector
* 4x SATA
* 4x PCI-Express - 2x 6pin and 2x 6+2pin
* 6x Molex Peripheral Connectors
* 2x Floppy Drive Connectors
* All Cables in black sleeving for better cable management
Features
* Peak Power 800W
* Dimension : 160(L)X150(W)X86(H)mm
* Automatic fan speed control
* Over voltage protection
* Over current protection
* Over load protection
* Short circuit protection
* Superior Active PFC( Power Factor Correction)
Specification:
Input:
* Voltage: 90-264VAC
* Frequency: 47-63Hz
* Current: 4A Max.at 230VAC