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the RM 550 is fine and im sure you would be ok with the RM450

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You'd be ok with 450. The RM is a great PSU too btw. If you're going with 450 you'll be limited in overclocking though, and since you've got an unlocked processor and a water cooling I'm guessing you were going to, at least a little.

If not a problem (it's a $10 difference) I'd still get the 550W, just to be sure and because that PSU is silent while not under a good % of its maximum output.

[spoiler=pc specs:]cpu: i5-4670k | mobo: z87-pro | cpu cooler: h100i | ram: 8gb vengeance pro | gpu: gtx770 ftw 4gb | case: nzxt switch 810 matte black | storage: 240gb ssd; 1tb hdd | psu: 750w corsair rm |
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The Corsair CX500M would be enough. It's pretty much Modular except for the 24 pin input

Corsair 400R, i7 3770K @ 4.5GHz 16GB, Corsair Vengeance 1600MHz, Gigabyte Z77X-UD5H Motherboard, 240GB Samsung 840 Evo Sata III SSD, 2 x Asus GTX 780 Direct CU2 SLI, Corsair H100i and Corsair AX860i Platinum Power supply.

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I'm ordering the Corsair 250d and a Corsair RM550 power supply, I'm going to be running a single GTX760 probably so won't need much more power etc

 

Is there a better power supply to use that's fully modular ?

 

Thanks  :)

May as well just stick with the 550, it carries enough to allow for more storage drives if you choose to add them and maintains head room for overclocking of the gpu and cpu. It could still manage on the 450, but over time PSU's put out less wattage, people buy bigger and better parts and both of these combined can potentially cause you to need a bigger PSU in future.

It's a good psu and having the extra 100 watts available wont make it draw more power from the wall or anything, unless your pc requires it to, so you will be fine.

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You could definitely get away with an RM 450

 

In terms of a better PSU, i don't think there is one at that price point

ofc there is.the xfx xtr 550W.

--

 

You'd be ok with 450. The RM is a great PSU too btw. If you're going with 450 you'll be limited in overclocking though

no he won`t be limited in nothing with a good 450W psu. not even with a gtx 770 . with his current specs and the cpu oc to 4.X,the rig would use ~250W

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TTL ran an i5, a GTX 780, a H100i and a few drives with the RM450 with no problems, the system pulled 419 watts from the wall at load.

CPU: 5930K @ 4.5GHz | GPU: Zotac GTX 980Ti AMP! Extreme edition @ 1503MHz/7400MHz | RAM: 16GB Corsair Dom Plat @ 2667MHz CAS 13 | Motherboard: Asus X99 Sabertooth | Boot Drive: 400GB Intel 750 Series NVMe SSD | PSU: Corsair HX1000i | Monitor: Dell U2713HM 1440p monitor

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