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Different processors with differnt TDP, but same consumption

post #1 of 3
Thread Starter 
I have a OCZ ModStream 520w power supply since few years now, and i've used it with all my systems, and it works well, but I keep getting the same overall consumption. I am measuring With a watt-o-meter how much power is my system eating, and I have some linear results:
On Idle: between 95-100 watt/hour
On Load: around 145-160 watt/hour

I had these same results also with my 2 other motherboard + cpu that i had:
1) Gigabyte 790FX + AMD X2 240 [CPU rated 65w]
2) Gigabyte 790FX + AMD X2 555 [CPU rated 80w]
3) Asus P8P67 Pro + i5 2500K (no OC yet) [CPU rated 95w]

All the above combinations had the rest of the components as in my system (in my signature: 2 HDD, 1 DVD-RW, ATI 4670 GPU)

I never get below 95w on idle, on load i guess It gets higher when the TDP rating increase, and with OC, but I am more interested in the Idle case, and I want to have the minimum that I can get.

My question:
I have a normal PSU, not one of those 80Plus standard (said to have 70% efficiency), if I get one of those 80Plus (silver or gold), will the overall consumption become less because of their better performance and efficiency? Do they make difference?
post #2 of 3
Quote:
Originally Posted by mcbyte View Post
I have a OCZ ModStream 520w power supply since few years now, and i've used it with all my systems, and it works well, but I keep getting the same overall consumption. I am measuring With a watt-o-meter how much power is my system eating, and I have some linear results:
On Idle: between 95-100 watt/hour
On Load: around 145-160 watt/hour

I had these same results also with my 2 other motherboard + cpu that i had:
1) Gigabyte 790FX + AMD X2 240 [CPU rated 65w]
2) Gigabyte 790FX + AMD X2 555 [CPU rated 80w]
3) Asus P8P67 Pro + i5 2500K (no OC yet) [CPU rated 95w]

All the above combinations had the rest of the components as in my system (in my signature: 2 HDD, 1 DVD-RW, ATI 4670 GPU)

I never get below 95w on idle, on load i guess It gets higher when the TDP rating increase, and with OC, but I am more interested in the Idle case, and I want to have the minimum that I can get.

My question:
I have a normal PSU, not one of those 80Plus standard (said to have 70% efficiency), if I get one of those 80Plus (silver or gold), will the overall consumption become less because of their better performance and efficiency? Do they make difference?
If you want lower idle numbers, you will have to get a smaller PSU. PSUs become horribly inefficient below 20% load. Potentially you could get a DC/DC power supply, but that's a lot of money and hassle. If you're trying to save money, you will probably not recoup the costs of buying a new PSU off idle wattage savings for a few years.

Assume best case scenario you manage to get your idle wattage down to say 65W from 95W, that's 30W, running 24/7 for a year that's like $30 savings at standard power rates. You'd save a lot more by just turning your computer off when not using it, and you wouldn't have to lay down the cash for a new power supply.
Bleeding Edge
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @ 5.0Ghz 24/7 ASUS P8P67PRO AMD 5870x2 8GB GSkill Ripjaw X 1600 @ CL8 
Hard DriveOSMonitorKeyboard
ADATA S599 64GB SSD + 2x 1TB Spinpoint (Raid 0) Windows 7 64Bit Dell 23" Razer Lycosa 
PowerCase
Seasonic X650 HAF X 
  hide details  
Reply
Bleeding Edge
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @ 5.0Ghz 24/7 ASUS P8P67PRO AMD 5870x2 8GB GSkill Ripjaw X 1600 @ CL8 
Hard DriveOSMonitorKeyboard
ADATA S599 64GB SSD + 2x 1TB Spinpoint (Raid 0) Windows 7 64Bit Dell 23" Razer Lycosa 
PowerCase
Seasonic X650 HAF X 
  hide details  
Reply
post #3 of 3
Thread Starter 
So, there is no need to get a new power supply?

I wanted to change it also to get a new more silent one, with longer cables, because now i had to use an extension on the 12v motherboard plug because it was short in my CM 690 II case.

Thanks for your answer
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