Corsair CX750M no longer great.. need recommendation

Nichrome

Nichrome

Nichrome

Associate
Joined
27 Oct 2014
Posts
197
Location
UK, Bristol
Hi all,

My 3 year old Corsair CX750M shows its age (or low quality?).
It screams when I overclock my i7 6700K to 4.8GHz or higher. And I mean it: screams. Just coil whine is on stock clocks...
5GHz is not possible because of this power supply.
I also get coil whine (coming from the power supply, not the GPU) since I got MSI GTX1070 Gaming 8G. It did also occur when I had GTX980 and GTX980Ti. Whether I use a single modular PCIe cable to connect 1x8 and 1x6 pin, or if 2 separate PCIe cables for 1x8 and 1x6, I get same whine from the PSU.
Running benchmarks that stress GPU to 70%+ and CPU to 60%+ load, PSU sounds like it will explode any second :eek:

I am looking for a Gold/Platinum rated power supply. Something sufficient to power:
1x CPU
1x GPU (always 1xGPU, never multi!)
2x HDDs and 4x SSDs (SATA)
1x Fan controller [molex] (6 fans) +3 fans connected to motherboard headers (all use 3pin headers)
1x watercooling pump (fan header)
1x custom LED strip [molex]
If Overclockers would sell nuclear power plant, I'd be buying one straight away :cool:

I assume that 600W would be sufficient.
Also I looked at Super Flower, Corsair, Seasonic and Silverstone.
I would like to avoid any other brand.
Budget: about 100-120GBP.
And full modularity is a must.
PS: I do not need a 2kW Super Flower from 8Pack :p 600-800W will do the job.

What are your suggestions?
 
A good quality 500w psu would be more than enough for your pc. The GTX 1070 is a extremely efficient card and even fully loaded when benching my pc (spec in siggy) only pulls a max of just under 300w at the wall. When gaming it's around 230w at the wall, dependant on the game. As you are heavily clocking the cpu though I have started at 550w and worked through the available units up to 750w which is just massive overkill. Keep in mind that tomorrow is the last full day that and of the suggested psu's will be on offer as the deals usually change around Wednesday lunchtime.

My basket at Overclockers UK:


​


The XFX XTR series are Seasonic built units with a single 12v rail. The 550w version has a 540w 12v rail while the 650w has a 648w 12v rail. They both have a 5 year warranty.

XFX XTR 650w review.
XFX XTR 750w review.


The EVGA GS 550w is a Seasonic built unit with 540w on a single 12v rail. It has a 5 year warranty.

EVGA GS 550w review.


The Superflower Leadex Gold series have a single 12v rail and the 550w version is able to deliver all of it's 550w available on the 12v rail, the 650w version can deliver 649w on it's 12v rail, the 750w version has 749w on it's 12v rail. All have 5 year warranties. Be warned that these units have bright white leds where you plug the cables in and they cannot be turned off.

Superflower Leadex Gold 650w review.
Superflower Leadex Gold 750w review.


The EVGA Supernova G2 series are built by Superflower and are basically a Leadex Gold with a different fan, no tacky leds and a longer warranty. Same as the Leadex Gold units they are all single 12v rail with the 550w and 650w able to deliver the whole of their outputs on the 12v rail while the 750w has 749w on it's 12v rail. The 550w (not sold here for some reason) and 650w versions have a 7 year warranty while the 750w and above have a whopping 10 year warranty.

EVGA G2 550w review.
EVGA G2 650w review.
EVGA G2 750w review.


The Superflower Leadex Platinum 650w is another single 12v rail design with 649w on the 12v rail. It has a 5 year warranty. This is particularly good value at the moment.

Superflower Leadex Platinum 550w review (no reviews for the 650w version).


The EVGA Supernova P2 series are also built by Superflower and basically their own Leadex Platinum units again with a different fan, no tacky leds and a longer warranty. All are single 12v rail with the 650w able to deliver all of it's 650w on the 12v rail and the 750w version able to deliver 749w on it's 12v rail. Both have 10 year warranties.

EVGA P2 650w review.
EVGA P2 650w and 750w review.


The Corsair RMx series are one of the best psu's that Corsair sell. They are very high quality units built by CWT and are both of a single 12v rail design. The 550w can deliver all of it's 550w on the 12v rail, the 650w version has 648w on the 12v rail and the 750w version has all of it's 750w on the 12v rail. All RMx units now come with a upgraded 10 year warranty.

RM650x review.
RM750x review.
 
I see that EVGA is quite popular PSU.
I think I will go with SuperFlower or EVGA, but that has to wait until Christmas :)

Thanks for your input!
 
Ace Modder said:
Is there any reason you don't want to consider Antec, the EDGE 650w unit would tick all the boxes for you.

Cick here to buy

eTeknix review
Click to expand...

You guys should look at sending some units to jonnyguru. So many people are sent there when asked for PSU advice and your products are fairly absent, nothing since 2014. Plus they seem to realise that power supplies are usually dull as dirt so the writers put a fair amount of humour into the reviews.
 
I had Antec PSU (500W) in my other (very basic: G3258, 750Ti, 16GB RAM) system. I had it maybe, 2 years, and it basically stopped working all of sudden, putting my system into restart loop. As soon as I connected my current CX750M, it started straight away. ((No offence, but the only Antec product I'd ever consider to buy would be the Antec 1900 case)).



So yes, there is a reason why I want to avoid any other brands really. I also looked at reviews (OC3D, KitGuru, JayzTwoCents, LinusTechTips and Tom's Hardware) but also my friends' opinions. None of friends mentioned Antec, XFX or EVGA really. All were Seasonic, Corsair and those living in the UK, SuperFlower.

I just ordered this one:
https://www.overclockers.co.uk/supe...platinum-power-supply-gunmetal-ca-049-sf.html

On sale (10 quid off, always a bit :) ). And Gunmetal has plain black cables (unlike "black" version with "colour coded" cables).

I could not wait really until Christmas.. My PSU started to cause restarts (quite randomly) in games (heavy ones). Tested with friend's AX1500i, system runs perfectly fine. GPU and CPU are overclocked, so in this case, a strong PSU is a must.
I will drop this Corsair into my basic system(I suppose it will last for a while in a low-end PC), and use SF in my gaming one.

Ideally I would like to buy a Seasonic unit (I think it's called Snow Silent?) but a bit too expensive for student's pocket :( And too expensive compared to any other PSU of similar spec (750W, platinum rating).

EDIT:
Just to add to that:
why the hell a braided cable kit is half price of my ordered PSU?! I wouldn't mind paying 60quid for a set if my PSU would cost 500GBP, but on the other hand, such expensive PSU could come with a sexy braided kit already.. wow.. Guess I know what I'll buy myself for Christmas: DIY sleeving kit..
 
Last edited:
Disco_P said:
You guys should look at sending some units to jonnyguru. So many people are sent there when asked for PSU advice and your products are fairly absent, nothing since 2014. Plus they seem to realise that power supplies are usually dull as dirt so the writers put a fair amount of humour into the reviews.
Click to expand...

Yeah I don't buy a PSU unless I can see reviews from people that review them properly.
 
pastymuncher said:
Why on earth did you order a 850w psu? Apart from the price premium you will never even get near half the available power.
Click to expand...

That was one of your recommendations:
https://www.overclockers.co.uk/evga...-platinum-modular-power-supply-ca-027-ea.html (priced at 122).

I bought more powerful (850W) for only 10 quid more.
I have not yet finished with my build really. I have yet to add 4 more fans(another radiator 240mm = 2x120mm for push and 2x120mm pull) and thinking about changing the case so I can fit more than 2x 3.5" HDDs.

I am already using 6 SATA cables (out of 8 from my current PSU), and 2 molex connectors out of 4 (I think).
PCIe connectors: true, I will not use all of them. But rather be safe on that side. I never know when I'll grab GPU that would use all of them (does such exist yet?) :p And maybe will SLI one day or another, but not at this moment.

So yeah... I know what I'm doing :)
 
I suppose the price isn't bad at £10 off but I recommended the EVGA P2 650w which has double the warranty. I would rather have the extra warranty than the 200w that will never be used. Fans add very little to power consumption. I had 6 fans on both of my rads, so 12 in total plus a pair of fan controllers along with the pair of 200m fans and 120mm fan in my case then a pair of pumps plus some leds and it didn't add much to power draw.
 
But it's the same psu. The EVGA P2 series are the Superflower Leadex Platinum just with a different fan, no led's and double the warranty. I even posted links to reviews and the first one is Jonnyguru, one of the most respected psu testers around and he gave it 9.8/10. Like you say it's your choice but don't write off top quality components without even reading up on them.
 
Well, most importantly: the noise gone away!
No coil whine from CPU, PSU or GPU. In fact, GPU whines a little when I go over 300FPS when disabling VSync (PayDay 2 for example). But under full load of CPU and GPU, it is very quiet.
PSU dead silent. It's decent one for sure, and no longer afraid of frying up my CPU or GPU.
I like the fact that one of the cables has 2xMolex and 2xSATA. This way, I didn't have to use separate SATA for 2 more drives and separate molex for LED strip and fan controller.

But I have 2 things to add about it:
1. In my case there is a "special" holder that is removable to keep the PSU in place. By any means, there is no way I can mount it properly (although PSU sits perfectly fine just on 4 screws attached to the case).
2. Plugging the cables into the PSU was quite hard. Felt like the ports in the PSU were not big enough.. Probably because PSU is brand new.

Thanks for advise ;)

And great service from OCers as always!
 
You must log in or register to reply here.
Back
Top Bottom