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Corsair TX750 Vs HX1000

Mussels

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This is half project log, half proving some points about power supplies that i see people comment on without any factual knowledge.

What i'm doing is swapping my PSU from a 750W to a 1000W, and recording the wattages in various tests. I'm expecting a slight wattage decrease especially in the higher wattage tests, not sure how it will vary in the windows idle test.

I am testing:
Off
S3 sleep
BIOS
Idle in windows
Extreme load in windows (synthetic tests)
Load in games with Vsync on and off

test done with following settings:
Monitor NOT included - measuring tower only.

3.9Ghz 1090TBE @ 1.375v
Ram @ 1600Mhz 1.65v
NB + HT @ 2.4GHz (stock volts)
5870@stock (no OC or voltage adjusts at all)
1x samsung F1 500GB (OS drive)
2xmaxtor 250GB in raid 0 (games drive)
1x optical drive
~5 120mm fans (hardly relevant, low wattage fans)

Test results:
Off
750 - 3W
1000 - 3W

'Idle' (BIOS)
750 - 245W
1000W - 245W - yup, identical

Idle (Win Desktop)
750 - 159W
1000 - 169W (higher - POSSIBLY due to a HDD idling on first PSU test)

standby (S3 sleep)
750 - 5W (note how its barely more than when its off)
1000 - 5W

Load (OCCT linpack + furmark peak) (this is maximum burn - no game or app will ever get this high, but you should make sure your system can handle it anyway)
750 - 462W
1000 - 448W - lower! this PSU's efficiency is in the higher wattages

and for a repeatable realistic game test...
Company of heroes, DX9 max: in game benchmark. peak value is recorded.

Main Menu:
750 - 202W (Vsync off: 267W)
1000 - 205W (Vsync off: 272W)

Benchmark (Vsync on):
750 - 291W - for about 2 seconds, most was in the 250-260W range
1000 - 300W for about 1 second, mostly 248W - slightly lower


Benchmark (Vsync off):
750 - 339 avg 320
1000 - 319W - 350W - better and worse at the same time, i call that 'near enough'

Conclusions from tests
A few things come to mind here, that arent obvious to most users.

1. idling in the BIOS consumes a fair bit of power, and outputs a fair amount of heat - almost as much as gaming! BIOS should NOT be considered idle, when watching temps!

2. Vsync drastically alters the power used, in high end systems. Ever wondered why one game causes you to overheat and crash, but not another? default Vsync settings could be why...

2.1 When people start contradicting common knowledge about certain cards being extremely hot (cough, fermi), this is probably why. reviewers test with Vsync off, these games having Vsync on will lower the power use and heat output drastically. I saved 40-70W turning Vsync on in CoH, making my temp controlled PSU fan much quieter.

3. S3 sleep mode is awesome. Barely using more power than a system that is off, yet you can resume whatever you were doing instantly.

4. The advice not to get an overkill PSU (a 1000W PSU for a 300W PC) is quite solid. you will save power and thus heat, getting a PSU that matches your requirements. Just remember that if you get a multi rail PSU that each rail is sufficient for what you'll have on them (EG, dont get a 700W with four 18A rails if you want to run a fermi - get one with two 35A rails instead)

4.1 since the HX1000 was a better quality PSU (more efficient design), moving out of its sweetspot is pretty much on par with the 750W anyway.

5. slightly contradicting above, this 1000W PSU has its fan spin up at a higher load/temperature, so its actually quieter than the 750W, despite using slightly more power. Thats worth considering at least.

Pictures, since everyone loves pictures!
just comparing the two PSU's and before/after of the inside of my case. irrelevant to tests.
 
Last edited:

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Mussels

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all the tests are done for the 750W, and information is given there that may help some people.

just waiting on the 1000W to arrive now.
 

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What methodology are you implementing? Viewing a killawatt at specific instances?

Oh and what are you trying to prove/disprove? Or are you doing this just for fun? :)
 

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Subbed, very interested in the results.
 

Mussels

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What methodology are you implementing? Viewing a killawatt at specific instances?

Oh and what are you trying to prove/disprove? Or are you doing this just for fun? :)

mostly for fun and education. using something similar to a killawatt, yes.


HX1000W has arrived :D
 
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less waffle more tests :p :laugh: :D


joking aside what meter are you using to see your usage and such, pics please
 

Mussels

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less waffle more tests :p :laugh: :D


joking aside what meter are you using to see your usage and such, pics please

Prodigit 2000MU, pics taken.


rewiring the whole PC while drinking takes longer than expected!
 

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Mussels

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its now 1am and i have the system working, i'll do the testing tomorrow.
 
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what crack on.gif :D

btw are you 120 or 220-240 volt and run at 50 or 60 hz ?

my local maplins store sells or sold them (haven't checked lately)
was tempted to buy one to run similar tests;)
 
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Subbed!
Some extremely informative testing here, hope you'll be updating soon.
 

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This will probably sound pretty newbish but what is "S3 sleep" and how do I get it.
 

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Global states

The ACPI specification defines the following seven states (so-called global states) for an ACPI-compliant computer-system:

* G0 (S0): Working
* G1, Sleeping subdivides into the four states S1 through S4:
o S1: All processor caches are flushed, and the CPU(s) stop executing instructions. Power to the CPU(s) and RAM is maintained; devices that do not indicate they must remain on may be powered down.
o S2: CPU powered off
o S3: Commonly referred to as Standby, Sleep, or Suspend to RAM. RAM remains powered
o S4: Hibernation or Suspend to Disk. All content of main memory is saved to non-volatile memory such as a hard drive, and is powered down.
* G2 (S5), Soft Off: G2 is almost the same as G3 Mechanical Off, but some components remain powered so the computer can "wake" from input from the keyboard, clock, modem, LAN, or USB device.
* G3, Mechanical Off: The computer's power consumption approaches close to zero, to the point that the power cord can be removed and the system is safe for dis-assembly (typically, only the real-time clock is running off its own small battery).

Check your BIOS under power settings to see what yours is set to.
 

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This will probably sound pretty newbish but what is "S3 sleep" and how do I get it.

Basically, if you tell the computer to go to sleep, or if you have it set to automatically go to sleep after a certain amount of time. Anything in the OS that is refered to as "Sleep" is S3 Sleep.
 

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what View attachment 39080 :D

btw are you 120 or 220-240 volt and run at 50 or 60 hz ?

my local maplins store sells or sold them (haven't checked lately)
was tempted to buy one to run similar tests;)

People living in down under uses 220-240V and 50Hz, just like the rest of the world less America.

^ that 240v@50Hz here.

Subbed!
Some extremely informative testing here, hope you'll be updating soon.

Yeah things just got complicated, had some lady friends stay over the night, so it delayed me :p


This will probably sound pretty newbish but what is "S3 sleep" and how do I get it.

Basically, if you tell the computer to go to sleep, or if you have it set to automatically go to sleep after a certain amount of time. Anything in the OS that is refered to as "Sleep" is S3 Sleep.

^ he covered that. Sleep mode or standby has S1 and S3. S1 basically turns off the screen and drives, but leaves the PC on. S3 powers everything but the ram off completely, so the machine can wake up instantly as needed but it consumes very very little power in the meantime.

Think of what happens when you close the lid on a laptop.
 
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Thank you gentlemen for that explanation. VERY interesting thread Mussels. :toast:
 
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Sweet thread Mussels as stated I am looking forward to seeing your results :D
 

Mussels

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results are in.

minimal changes exactly as expected between the PSU's
 

Fourstaff

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Mussels

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newtekie1

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dont get a 700W with four 18A rails if you want to run a fermi - get one with two 35A rails instead

I don't agree with that, a Fermi graphics card will work fine on a four 18A rail PSU. You just have to connect the card to more than one rail.
 
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I don't agree with that, a Fermi graphics card will work fine on a four 18A rail PSU. You just have to connect the card to more than one rail.

I think you are both right and wrong at the same time. The most important thing when buying a PSU is quality!, not how the rails are set-up.
 
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