PSU: AX760, HX750 or RM750x

jaekjakob · Jan 13, 2018

Hi!

As of now I own the Corsair CX750M which unfortunately, which is the reason I'm looking to purchase a new PSU, emits a loud high-pitched noise whenever the system is put under load. I'm asking the community to help me decide which of the three aformentioned powersupplies deserves my money. I live in Sweden and their prices are as follows. AX760 retails for 182 euro, HX750 for 172 euro and the RM750x for 117 euro without shipping.

PS Please do not recommend other PSUs. I am aware of the G2 and the P2, the Seasonics and the Superflower. Due to me having bought the "Corsair Professionally sleeved cable kit, Green" a couple of years ago, I'd rather stick with Corsair branded PSUs.

vapour · Jan 13, 2018

1. RMx is good enough.
2. Can you list your rig? You may need less than 750 good quality PSU.
3. Cost on the cables you bought? is Seasonic and superflower much more expensive than corsair?

jaekjakob · Jan 13, 2018

vapour :

Since I pull 670 watts from the wall while gaming 750 is the closest most sane wattage. I understand that the RM750x will do the job, it's just that I might as well buy the best available, but I need to now if there's deminishing return. I.e if lets say the HX750 is hard to differentiate from the alot cheaper Rm750x then there's no reason to throw money. The cables cost approx 100 euro including CPU and MOBO cables.

n0ns3ns3 · Jan 13, 2018

RMx is more than good enough. So you don't NEED a better PSU.
AX is better but it's the same better as with BMW vs Bentley better

If you are 100% sure that your system is pulling almost 700w from the wall, I'd recommend to get an over 850w PSU. Like RM850x or RM100x.
PSUs do their best when running 50-70% of their capacity under load.

vapour · Jan 13, 2018

RMx is top tier, no need to spend that extra for AX or HX. How do you measure 670? Just curious, can you share your build? As above said, if 670 pull is for sure, you will want to leave 20% head room for the sake of longevity of PSU, you need to multiply by 1.25 of 670 and you will get 850+ is needed. Do you have a website to check PSU prices?

jaekjakob · Jan 13, 2018

vapour :

I have to apologise, it seems I read it wrong. I pull 570 from the wall which I measured with a Luxorpart energymeter plugged into the wall. I have come to the conclusion, thanks to the contributing users, that I'll buy the RM750x seeing how it's difficult to back up the price difference. But I'll still list my components, just because people asked.

Chassi - NZXT H440 Midi Green
MB - Asus Z370-P
CPU - Intel i5-8600k 4.6GHz
GPU - Gigabyte Geforce GTX 1080 Aorus (@1893 MHz GPU clock and 10 GHz Memory clock)
RAM - Corsair Vengeance DDR4 2x8 GB 3000MHz
SSD - Samsung 840 EVO 250GB
HHD - Seagate 2TB 7200RPM
Power Supply - Corsair CX750M
CPU Cooler - Corsair Hydro H80i V1
Fans - 4 Corsair AF140 Quiet Edt. Red LED
Cables - Corsair Professional Sleeved Cable Green
OS - Windows 10

vapour · Jan 13, 2018

Not sure about that reading, but RMx 650 is more than enough. However, it doesn't hurt to get 750

n0ns3ns3 · Jan 13, 2018

this system can not pull that much power even theoretically. well, unless you forgot to mention second GPU.
Typical power draw while gaming, should be 250-300w.
With aggressive overclock + GPU power mod + simultaneous synthetic load on both CPU and GPU could push towards 500w. But that's very far from any gaming load.

jaekjakob · Jan 13, 2018

n0ns3ns3 :

I use the application Folding@Home quite alot. Me being a simpleton also realised that the energymeter had a powerstrip plugged into it, meaning that pc including speakers, a small fridge and 2 screens added to the total power. But it can't amount to 570. I honestly can't answer to why it draws that much.

vapour · Jan 13, 2018

n0ns3ns3 :

300 is too low, OCed 8600k can pull in 160 W and 1080 FE can pull in 300+, factory tweaked version can pull more. Note: those are extreme case to give you an idea how much power your rig can draw. I think 570 is max it detected, most of the time load may be lower.

aHR0cDovL21lZGlhLmJlc3RvZm1pY3JvLmNvbS9CL00vNzE5Njk4L29yaWdpbmFsL2ltYWdlMDAxLnBuZw==

vapour · Jan 13, 2018

jaekjakob :

I personally will get 650, but 750 is playing safe, no issue with that.

jaekjakob · Jan 13, 2018

vapour :

I use pricerunner.

n0ns3ns3 · Jan 13, 2018

with all the other devices you mentioned, it makes sense.

n0ns3ns3 · Jan 13, 2018

vapour :

n0ns3ns3 :

300 is too low, OCed 8600k can pull in 160 W and 1080 FE can pull in 300+, factory tweaked version can pull more. Note: those are extreme case to give you an idea how much power your rig can draw. I think 570 is max it detected, most of the time load may be lower.

That's exactly what I said:
TYPICAL GAMING - 250-300w
EXTREME SYNTHETIC LOAD - 450-500w

jaekjakob · Jan 13, 2018

n0ns3ns3 :

I understand your reasoning. There's a caveat though. I play Battlefield one at 144Hz in 1080p (I know a gtx 1080 is overkill, I'm planning on moving to 1440p) and my CPU is pinned at a 100% (with a max temp of 68 degrees Celsuis both CPU and GPU) and so is my GPU 50% of the time. So I'm fully utilizing my components. Weirdly enough I've heard that games don't user more than 1 core, (thinking right?) but in task manager I'm using all 6.

jaekjakob · Jan 13, 2018

Unfortunately it has come to my attention that the RMx series do not support my sleeved cables, they only work on RM PSUs.... I might be forced to move up to the HX750 but then there's only 10 euro difference between the most premium one, the AX. I suppose I'll have to live with black instead of green cables, we'll see.

Karadjgne · Jan 13, 2018

If the sleeves are extentions, they'll support any psu, the component side are universal. If the sleeves are not, meaning they hook directly to the psu, then they only support the exact model specified, meaning chances are if built for a cx750m, then they probably will not work on any other psu. Pinouts are different.

So makes no difference which psu you use, you need to match the sleeves to the psu, not the other way around.

jaekjakob · Jan 13, 2018

Karadjgne :

It is a Corsair Profesionally sleeved cable kit. Not specific to CX750M. Only compatible with certain generations of certain series of PSUs.

n0ns3ns3 · Jan 14, 2018

load % does not reflect power usage.
There are different blocks in CPU/GPU doing different things. Loading any of them will result in 100% usage but with very different power consumption.
For CPU examples of different blocks would be Integer, float, or some special instructions like SSE or AVX.
So in some scenarios a 100% for your CPU would be 100w while in others it would be 150w.
Same goes for GPU. Just run Furmark and Heaven and compare the power consumption. Both will load the GPU to 100%.

PSU: AX760, HX750 or RM750x

Prominent

Champion

Prominent

Illustrious

Champion

Prominent

Champion

Illustrious

Prominent

Champion

Champion

Prominent

Illustrious

Illustrious

Prominent

Prominent

Titan

Prominent

Illustrious

Share this page