How do you (easily) tell if you are close to or over the capacity of the power supply?
Some thoughts - a power meter is usually found in a crunchers toolbox! These are inexpensive and a good to have. Some PSU's now have a voltage USB interface.
Check you have sufficient power capability on the rail you intend to connect it, and correct cabling to connect direct to PSU - and of course cooling will be more problem you nay need more fans etc.
Just to add to Zalster's power calculator (i put both my systems in, and the numbers were close to actual) - i notice they add ~10% headroom.
It is worth noting most PSU are at their most efficient in the 40-80% of maximum. The inefficiency also generates heat, so i try to keep mine running under 70% of capacity. If you get a 5% efficiency saving that is a lot of electricity (and heat) over a 7x24 life of say a 500W system. It usually pays for itself.
You should be able to look up your PSU here 80 Plus PSUs and look over the efficient graphs.
How do you (easily) tell if you are close to or over the capacity of the power supply?
Simple fast calculation, example:
1x CPU max TDP = 95 W (AMD Athlon II)
1x GPU max TDP = 160 W (GTX 460)
1x MB + 1 fan = 20 W
1x HDD = 10 W
Totally approx 285W. But, usually even boinc will not load all components together on their max, unless you really want it.
Reliable 300W PSU (Seasonic, old Enermax,...) would be enough, but not for 24/7 load, unless you want to brick it (or its capacitors) in a few months or a year.
Optimal load is 50-75% of declared PSU output.
Also, you should check performance of each 12V and 5V branch, not to add them up.
Notice if you use wattmeter -
input of the PSU will be always higher than the output. If efficiency is 80%, the input of 300W PSU will be approx 375W.
Do not panic if you see higher number than PSU declares ;-)
Interesting way is to run 2x PSU at once. You may supply your GPU(s) from a different PSU than your MB, for instance.
If you intend to crunch BRP6 tasks (Parkes PMPS XT) the beta test app which uses cuda55 will give you about a 25% performance improvement over the default cuda32 app on modern nvidia GPUs like the 750Ti or the 960. If you allow beta test apps in your preferences, you will automatically be given the cuda55 version. I don't think older architectures like the 560Ti would see much (if any) benefit.
Hmm...
cannot see any difference between GTX760 and GTX570 running in the one 790FX motherboard, each in x16 slot.
The same run times.
Yeah,
570 is 320bit, while 760 is 256bit, important factor for E@H.
Then, speed depends of course on the CPU,... etc. Mine is old athlon II.
Depending on the GPU, it will
)
Depending on the GPU, it will vary.
Best way to figure out how big of a PSU you need is with a calculator
I like this one but EVGA also has one. Just plug in your info about your system and it gives you an idea about how much power you need
http://outervision.com/power-supply-calculator
RE: How do you (easily)
)
Some thoughts - a power meter is usually found in a crunchers toolbox! These are inexpensive and a good to have. Some PSU's now have a voltage USB interface.
Check you have sufficient power capability on the rail you intend to connect it, and correct cabling to connect direct to PSU - and of course cooling will be more problem you nay need more fans etc.
Just to add to Zalster's power calculator (i put both my systems in, and the numbers were close to actual) - i notice they add ~10% headroom.
It is worth noting most PSU are at their most efficient in the 40-80% of maximum. The inefficiency also generates heat, so i try to keep mine running under 70% of capacity. If you get a 5% efficiency saving that is a lot of electricity (and heat) over a 7x24 life of say a 500W system. It usually pays for itself.
You should be able to look up your PSU here 80 Plus PSUs and look over the efficient graphs.
Good luck.
RE: Hi, A related question
)
The website tomshardware.com has done lots of tests on the various gpu's and one of their test results is the minimum and maximum a given gpu will require. Here's an example of what came up when I did a search for the 'power consumption for an AMD 5870':
http://www.tomshardware.com/reviews/radeon-5870-eyefinity6,2595-12.html
It's down a bunch of pages but eventually you will see the numbers.
RE: How do you (easily)
)
Simple fast calculation, example:
1x CPU max TDP = 95 W (AMD Athlon II)
1x GPU max TDP = 160 W (GTX 460)
1x MB + 1 fan = 20 W
1x HDD = 10 W
Totally approx 285W. But, usually even boinc will not load all components together on their max, unless you really want it.
Reliable 300W PSU (Seasonic, old Enermax,...) would be enough, but not for 24/7 load, unless you want to brick it (or its capacitors) in a few months or a year.
Optimal load is 50-75% of declared PSU output.
Also, you should check performance of each 12V and 5V branch, not to add them up.
Notice if you use wattmeter -
input of the PSU will be always higher than the output. If efficiency is 80%, the input of 300W PSU will be approx 375W.
Do not panic if you see higher number than PSU declares ;-)
Interesting way is to run 2x PSU at once. You may supply your GPU(s) from a different PSU than your MB, for instance.
Check TDP of your CPU and GPU:
http://www.cpu-world.com/
http://www.hwcompare.com/
RE: If you intend to crunch
)
Hmm...
cannot see any difference between GTX760 and GTX570 running in the one 790FX motherboard, each in x16 slot.
The same run times.
Yeah,
570 is 320bit, while 760 is 256bit, important factor for E@H.
Then, speed depends of course on the CPU,... etc. Mine is old athlon II.