Need to chosse psu for 560gtx

[blackshadowzx]

Hi im trying to find a osu for 560gtx-ti twin froze ii oc i need to support it to suppor later sli

my build

intel i5-3750k

asus maxiums V GENE

yes im going to oc the gpus so any sugestions thx in advance

 

[henydiah]

you need 700 - 760W for plan SLI .. just buy good recommend PSu review and depend your budget

 

[jwk3]

if you are looking for a cheap half decent PSU look at an OCZ ZS Series 750W. This is the cheapest PSU I can find in my country (UK) that has 4x 6pin PCI connectors and that is from a reputable brand. I'd suggest this if you are tight for budget, which really it doesn't look like you are (buying a high end mobo). Something with a bit more power would be nice though.

I can say from when I've hooked up my PC (OCed 2500k and OCed Asus 560 Ti) to a watt-meter I've got 440W from the wall (running Prime95 and Furmark), so around 350W being drawn from the PSU. A QUALITY 750W+ would be ok for 2 cards, my calculations adding in 2 GPU loads makes it 720W (drawn from PSU), and that's with Prime95 and Furmark running, actual gaming use I found to be over 100W less.

Although a bigger one wouldn't hurt, as PSUs run more efficiently at 40-60% load, as well as having a bit of headroom is nice.

For other forum members here are my measurements for if you want to know how much power MY 560 ti and i5 2500k draw:

-----------------------------------------------------------------------------------
PC with CPU at 4.4GHz 1.3v + GPU at 920 core and stock voltages-

actual gaming (BF3): 290W
CPU at 100% with prime95: 180W
GPU at 100% with furmark: 360W
combined P95 + FM: 440w

------------------------------------------------------------------------------------
PC with CPU at 4.9GHz 1.5v + GPU at 1GHz 1150mV (maxed out worst case scenario)

CPU at 100% with prime95: 250W
GPU at 100% with furmark: 480W
combined P95 + FM: 590W

ALL MEASUREMENTS ARE TAKEN FROM THE WALL, so add in the rough 0.8x calculation for the PSU efficiency.

 

[bigcyco1]

Hi i currently overclocking @ 4.5ghz 24-7 use and i am running X2 Gigabyte GTX 560TI in SLI mild overclocking on those as well you need 750Watts this is the one i am currently using http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021&cm_sp=Cat_Power_Supplies-_-Spotlight-_-17-139-021 but if your on a budget you could always get something like this http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=419877&Sku=T925-3083 i have a few friends that use it and they are also running GTX 560TI in SLI hope this helps

 

[blackshadowzx]

thx for the help

so you guys suggest i get a 850watt psu found this one http://www.newegg.com/Product/Product.aspx?Item=N82E16817139022

 

[bigcyco1]

Yeah that is the one i have and it has not let me down you could even get something like this though http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=419877&Sku=T925-3083 you really only need 750watt if money is a issue get that but if i was you i go with 850watt for better upgrade paths later and sufficient breathing space.

 

[ko888]

For a system using two MSI N560GTX-Ti Twin Frozr II/OC graphics cards in 2-way SLI mode a minimum of a 700 Watt or greater power supply that has a combined +12 Volt continuous current rating of 54 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors is recommended.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

 

[bigcyco1]

As much as the power (Watts) requirement matters, the current requirement, measured in Amps is as important if not even more important. This is especially true if you have a or several dedicated video card(s). As a general rule of thumb, you’re aiming for the highest number on the 12V line.

 

[bigcyco1]

Power Supplies that are certified 80 PLUS have been independently tested for their efficiency. Now, there are 4 different 80 PLUS certifications, depending on how efficient the power supply is:

80 PLUS: The power supply is at least 80% efficient at 20%,50% and 100% load
80 PLUS Bronze: The power is at least 82% efficient at 20% and 100% and 85% efficient at 50% load.
80 PLUS Silver: The power is at least 85% efficient at 20% and 100% and 88% efficient at 50% load.
80 PLUS Gold: The power is at least 87% efficient at 20% and 100% and 90% efficient at 50% load.

The 80 PLUS and higher certifications are the way to go when you are looking for an efficient power supply.

Do not trust specifications such as “Efficiency: 80% to 85% Efficiency Typical” that are not 80PLUS certified. 80 PLUS is an independent standard test. No 80 PLUS and “Efficiency: 80% to 85% Efficiency Typical” means that it is 80% to 85% efficient, according to the manufacturer that is, using their own in-house test, which may or may not so much represent real efficiency.