Sandy Bridge/Ivy Bridge power consumption

[tigersty1e]

People with kill-a-watt or similar power usage meter comment here.

I'm showing 140 watts idle and 280 watts prime95 load with my chip at 4.0 ghz. Core i7 920.

I'm looking to see what kind of power savings I would realize going to SB or IB.

What kind of idle and prime95 load numbers do you have and what clocks for your IB or SB?

 

[ShintaiDK]

My setup uses around 40-50W idle and less than 100W at 100% CPU load. Note I´m running stock tho.

 

[Ventanni]

I don't have the exact numbers, but even Sandy Bridge should be significantly more power efficient than a 920, especially in the idle performance figures.

 

[Blades]

My sb with asrock idles at around 36... My ivb with the gigabyte z77x-ud5h idles at 42-48.. This is measured with my ups... which obviously measures in steps of 6 watts.. I have the qualcomm atheros lan turned off on my gigabyte board.. there is also an onboard usb 3.0 hub.. that may be part of the power consumption contribution when comparing.

Power usage with hw monitor for the cpu reads lower on ivb, by a decent amount. 100% load power consumption is much less on the ivb, despite the board difference. Then again, the sb is @ 5.1-5.2 - ivb @ 4.646 (48W idle)/ 4.545 (42W idle).

Both systems lack any add on cards. Just mobo, ram, and cpu. No fans, just h100.. and same vertex3 120gb ssd.

 

[Don Karnage]

 

[BTRY B 529th FA BN]

You have to include EVERY piece of hardware that is consuming electricity when you measure watts from a wall mount reader, e.g. fans, HDD, etc.

My 95w idle i7 920 rig is this:

Seasonic X 650 (totally overkill, i know)
Asrock X58 Xtreme (it's sooo extreme *rolls eyes*)
5770 HD AMD
SSD
2x120mm fans

I found adding more ~ 120mm fans will add about 7w per fan from the wall

 

[tigersty1e]

My setup uses around 40-50W idle and less than 100W at 100% CPU load. Note I´m running stock tho.

is this with your gtx580?

what else is in the rig besides the items in your sig?

so 45 watts idle?

With 3570k, gigabyte ud3h, 6950 (and fan), x-fi titanium, 2 hard drives, 1 ssd, 3 fans, 1 dvd burner, and fan controller, I'm idling 90 watts and prime 95 load at 150 watts.

 

[blastingcap]

You have to include EVERY piece of hardware that is consuming electricity when you measure watts from a wall mount reader, e.g. fans, HDD, etc.

My 95w idle i7 920 rig is this:

Seasonic X 650 (totally overkill, i know)
Asrock X58 Xtreme (it's sooo extreme *rolls eyes*)
5770 HD AMD
SSD
2x120mm fans

I found adding more ~ 120mm fans will add about 7w per fan from the wall

Yes and the results of adding up the non-CPU/GPU components' energy usage may surprise you. It surprised me, at least: http://www.bit-tech.net/hardware/pcs/2010/02/24/energy-efficient-hardware-investigated/8

Aside from obvious factors like PSU efficiency, even seemingly minor things like going from 1.65v to 1.35v RAM impacts wattage at idle and load... it all adds up. Case fans, too, and other things they didn't measure like USB devices attached to the computer (keyboard, mouse), etc.

 

[2is]

Idle: 80 watts
Prime95 Small FFT: 164watts
IBT: 179watts

In addition to the sig specs I have:

2x120mm fans (one on heat sink and an exhast fan)
1x200mm exhaust fan
3x Optical drives
5 or 6 USB devices

Both the case fans are set to their lowest RPM setting HSF varies with load.

I'm running dual monitors with my secondary being driven by the IGP. There is approximately a 30watt increase in idle power draw when my 680 is driving both monitors.

I'm OCed to 4.2GHz with a +.015 offset. Memory voltage is at default (1.5)

 

[ShintaiDK]

is this with your gtx580?

what else is in the rig besides the items in your sig?

so 45 watts idle?

With 3570k, gigabyte ud3h, 6950 (and fan), x-fi titanium, 2 hard drives, 1 ssd, 3 fans, 1 dvd burner, and fan controller, I'm idling 90 watts and prime 95 load at 150 watts.

Only what you see in my sig. Chassis got 1 fan. Intel stock heatsink. no HDs, no opticals. Onboard audio.

And I got a GTX680, not 580.

 

[sm625]

You would save about 60 watts idle, nearly 100 load. So you would save about a penny per hour in electricity (including monthly surcharges etc). Meh.

 

[2is]

You would save about 60 watts idle, nearly 100 load. So you would save about a penny per hour in electricity (including monthly surcharges etc). Meh.

That could add up to a lot particularily if you have a situation similar to mine where you have very hot Summer months with the AC blasting. That extra 100 watts being dumped into the room also means AC running more frequently.

 

[philipma1957]

I have 2 builds my 2500k with a hd6870 card runs at 131 watts with 2 ssds 3 fans and typing this along with prime 95 doing a test. no oc

my 2500t with a hd7750 sapphire ultimate runs at 80 watts running the same as above. this system idles at 38 watts and if I am typing this about 42 watts. It runs netflix at 47 to 51 watts and a blu ray disk at 70-75 watts.

This is a great build for htpc/low power/ some gaming.

It makes me want to find an i7 3770t.

IT may be the best chip for a fan free low power htpc. 2 ssds and just use the hd4000 igpu.