Something alternative to consider:I've gone over and not included a mouse or keyboard.
YOUR BASKET
1 x Asus VS228H 22" Widescreen LED Multimedia Monitor - Black £109.99
1 x Intel Core i3-3220 3.30GHz (Ivybridge) Socket LGA1155 Processor (77W) - Retail £99.95
1 x Sapphire HD 7750 1024MB GDDR5 PCI-Express Graphics Card £77.99
1 x ASRock B75 Pro3-M Intel B75 (Socket 1155) DDR3 Micro ATX Motherboard £55.99
1 x OCZ ZS Series 550W '80 Plus Bronze' Power Supply £49.99
1 x Seagate Barracuda 7200.12 500GB SATA 6Gb/s 16MB Cache - OEM (ST500DM002) £45.98
1 x BitFenix Merc Alpha Gaming Case - Black £27.98
1 x Patriot Viper "Black Mamba" Generation 3 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (PV38G160C9K) £23.99
1 x Samsung SH-S222BB/BEBE 22x DVD±RW SATA ReWriter (Black) - OEM £14.99
Total : £521.86 (includes shipping : £12.50).
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It is not a cheap and nasty PSU, and 7850 only require ONE PCI-E 6pin. People use it with Quad cores systems and graphic card that use both the PCI-E 6 and 6+2 pin provided and runs perfectly fine....and for this build it is only with a low power consumption Pentium (Sandy) dual-core with no HT.I wouldnt power a 7850 with the CoreXtream.
No offense, but I don't see how significant the "possible" PSU issue is (there's no negative feedbacks who by users much higher power consuming systems), comparing to guarantee having only half the graphic grunt of the 7850 2GB. But of course ideally it would be good if OP's friend can stretch another £20 to get the OCZ ZS 550W. But if he really can't stretch that, then the OCZ CoreXtream would still do fine.It may not be cheap and nasty but its not made by a well known OEM.