Which 8 pin CPU to use Tags: Power Supplies CPUs Corsair Components Last response: January 14, 2011 2:57 AM in Components Share Vlad23423 January 14, 2011 1:08:21 AM I just bought a Corsair AX850 which ships with 2 EPS12V CPU cables. The PSU will be connected to a P6X58 Premium board (8 pin connector). One connector has two 4 pin connectors on one end, which I assume both go to the mobo while the 8 pin on the other end would go to the PSU. And not the other way around. Is that correct? Now the other connector has the same two 4 pin connectors on one end, but it has a 12 pin connector on the other end (but only 8 pins are functional - i.e. 4 don't have any metal). Why is that? Thanks Sorry for the dumb questions. This my second build, just want to make sure it goes well without too much smoke. More about : pin cpu | E-mail me updates | Report abuse Register or log in to remove Vlad23423 January 14, 2011 1:09:33 AM p.s. this is a modular PSU..both ends need connecting. | Report abuse tecmo34 Power supply Master CPUs Master January 14, 2011 1:16:37 AM This should explain things... http://www.hardwareheaven.com/reviews/1020/pg3/corsair-... The 8pin (4+4) connects to the motherboard and the second 8pin (4+4) connects to motherboards like the ASUS Rampage III to give better support for overclocking. | Report abuse Vlad23423 January 14, 2011 2:32:12 AM Sorry, I guess original post wasn't clear. The PSU ships with 2 cables - because it is a modular PSU, each cable has 2 connectors in this case. 1. Cable 1 has a 4+4 on one end, pretty sure that one should go to the mobo. Cable 1 had an 8 pin (non-detachable) on the other end, which should go to the PSU. 2. Cable 2 also has a 4+4 on one end. Cable 2 has a 12 pin on the other end, but only 8 of the pins have contacts. What is it for?? | Report abuse tecmo34 Power supply Master CPUs Master January 14, 2011 2:46:10 AM 1.) Correct... 2.) It is for motherboards that support two 8pin ATX cords. You plug the 12pin (8 used) in one of the PCIe slots on the power supply. Since the PCIe use all 12pins, the 8pin ATX has four pins empty to prevent overload/damage. | Report abuse Vlad23423 January 14, 2011 2:57:20 AM Ok ....that makes sense.. Thanks! | Report abuse Register or log in to remove Ask the community Publish Tom's Hardware>Forum>Components>Which 8 pin CPU to use> Related ressources: ForumCan I use a 4 pin cpu cable to power my Asus M5A97 ( 8pin )? ForumWhich is best? a mobo that has a 4 pin or 8 pin cpu power connector ForumCorsair 8 pin breakaway 4 4 connector which side do i use ? ForumIs it ok to use an 8 pin CPU power connector for a I3-540? ForumCan I plug a 4 pin supplementary CPU power into an 8 pin motherboard? ForumPSU 4- pin cpu rail to 8-pin mobo? ForumNew PSU and MOBO which 4 pin should I use ForumThe other 4 pin CPU connector is not connecting to the 8pin ... ForumNo 8-pin pci-e on my power supply... should I use 6 pin or 2 molex? ForumUse PCI-E plug for 8 pin power connector? ForumGood Power supply For 8 pin cpu motherboard ForumCan I use 8-pin 12v in my P35-DS3L 4- pin connector? ForumQuestion about 8 to 4 pin cpu connector ForumCan I use a 8-pin 12v connector on a 4- pin ? ForumNew Powersupply has 20+4 pins, can I use the 4 on the CPU 4 pin ? ForumUsing 4 pin cpu power supply on 8 pin Forum8-pin vs 4- pin CPU Power Connector ForumBest Cpu cooler for ~40 ForumWhich CPU Forum[Solved] CPU Vcore not sure which is correct More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !