On Fri, 22 Nov 2024 11:33:32 +0000, Theo wrote:
David <wibble@btinternet.com> wrote:
Still struggling with PSUs.
Amazon has this:
<https://www.amazon.co.uk/Corsair-RM750e-Modular-Low-Noise-Supply/dp/
B0BYKT9SNJ/?th=1>
which is actually the 850e at £88.99.
There is also:
<https://www.amazon.co.uk/Corsair-RM750e-Modular-Low-Noise-Supply/dp/
B0BYKHQWXF/?th=1>
at £84.99 (allegedly down from £129.90).
I would normally go for the more powerful option, but the 750e is on a
big discount compared to other suppliers whilst the 850e is only a few
pounds cheaper.
I deduce that the difference must be ATX 3.0 vs ATX 3.1.
The use is for my venerable desktops (as I thing two of them have dodgy
PSUs).
However I suppose I should have one eye on the future in case I have to
replace the MoBo.
Is ATX 3.1 relevant to anything apart from the latest high powered
machines?
As usual, I am swamped by too many options!
https://www.corsair.com/uk/en/explorer/diy-builder/power-supply-units/
atx-30-vs-atx-31-whats-the-difference/
It seems to be the only main difference is to do with high power GPUs,
which were/are a mess due to the new 12VHPWR connector catching fire in certain circumstances.
Efficiency reports for the RM750e: https://www.clearesult.com/80plus/sites/80plus/files/manufacturer-
certificate/CORSAIR_RPS0147%20%28CP-9020248%29%20%28RM750e%29_750W_SOCE% 206548_Report.pdf
and RM850e: https://www.clearesult.com/80plus/sites/80plus/files/manufacturer-
certificate/CORSAIR_RPS0157%28CP-9020249%29%28RM850E%29%20_850W_SOCE% 206787_Report.pdf
shows there's not a lot in it efficiency wise (bear in mind though that
these are measured at % of full load, so for a fixed load you'll take a higher percentage of max load on the smaller PSU. Really what you want
is to draw a horizontal line on the red line plot at a fixed power and measure the thickness of the red line there - but here it looks pretty similar)
Unless you think you're going to be fitting a jumbo GPU in future,
either should be fine for a domestic PC, whose power will often barely
touch 100W most of the time.
Theo
Thanks.
The reports I have read thus far seem to say that both use the same set of components, although they differ on how good/bad this is.
Mainly reviewers seem to like Japanese components more.
Based on all this I can't really see a justification for the much higher
list price (or at least the general non-discounted price) of the 750W
unless it is purely on the GPU power lead and slightly more recent certification.
I think I will go for the 850W for the extra bit of headroom.
As usual, I probably won't know if I have made the correct decision for
months, if not years.
Cheers
Dave R
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