HD 5570 with a 150 watt psu?

[bart1975]

Would it be possible? I know it states it should have a 400 watt psu. I was wondering if I could underclock it and it would work or would it not boot with a 150 watt psu at all?

 

[Lonyo]

Depends on what other components you have with it.
Also depends on whether it's a real 150w PSU or not, which hopefully it might be if it's for a SFF PC.

Here's some power consumption numbers of a few super low power systems:
http://www.xbitlabs.com/articles/cpu/display/core-i3-2100t_11.html#sect0
So if you have a low enough power CPU then adding a ~45w TDP HD5570 would still keep you under 100w, which would be fine IF the 150w PSU is a good 150w PSU.

 

[bart1975]

My system is the following.
Athlon II x3 450 @3.1Ghz undervolted to 1.3 volts. Default is 1.4 volts.
Asus M4A88T-I DELUXE
6 gigs of 1066Mhz ddr3
128 gig SSD+ 64 gig SSD
Antec ISK-300-150 case/psu

I would not mind underclocking a hd5570 since it has a 128 bit memory bus compared to the 64bit a 5450 has. My choices are between a HD 5570 and a HD 5450.

I would take a guess that my system is probably using about 105 watts of power during full load.

 

[nanaki333]

you should be able to get away with it

 

[toyota]

that is not what I would consider a low power cpu. no way would I risk running that entire pc under full load with a 5570 on a 150 watt psu.

 

[LiuKangBakinPie]

that card is low profile but there is a limit to what you use with low profile. Maybe a 250w psu or a 300w psu from Dell but not a 150w psu. You got a triple core running at 3.1Ghz. That's asking a bit too much. Rather get a Corsair 430w psu their cheap

 

[bart1975]

My case is a MITX case so replacing the psu is not an option. So you think the 5450 is the better option then?

 

[Termie]

My system is the following.
Athlon II x3 450 @3.1Ghz undervolted to 1.3 volts. Default is 1.4 volts.
Asus M4A88T-I DELUXE
6 gigs of 1066Mhz ddr3
128 gig SSD+ 64 gig SSD
Antec ISK-300-150 case/psu

I would not mind underclocking a hd5570 since it has a 128 bit memory bus compared to the 64bit a 5450 has. My choices are between a HD 5570 and a HD 5450.

I would take a guess that my system is probably using about 105 watts of power during full load.

Do you already have the parts? There's a reviewer on newegg who says the case psu won't work with your exact motherboard. Power cable too short.

Honestly, while that antec psu is as good as you'll get at 150, your cpu is really pushing it. The gpu might push you over the edge. I'd play it safe with a 5450.

If you already have the system built up with integrated graphics, buy a killawatt for $17 and test the power draw. Good investment for peace of mind. Then you'll know whether you have the reserve power for the 5570.

 

[LiuKangBakinPie]

You can try the 5570 if it doesn't work then you'll have to think about a Seasonic small form factor psu. that's the ones with the STX extensions. But they cost a bit more. The SeaSonic S12II 330W 80 PLUS you can also have a look at they're going for 50usd. I got one hooked up to my Ion HPTC. Great lil psu.

Can you look at the side or the back if the psu and look under the 12v and 3v there should be two totals if you combine them normally makes the total rated watts. Can you post them here.

 

[pcunite]

My Quad core system with an nVidia 8800GT and playing a mild game only draws about 120 watts from the wall testing via a Kill-A-Watt meter. However, you need a little extra to handle the overhead of bootups and run away processes. As long as you have enough amps on the right rail (you should get single rail really) you'll be okay. The trouble is the cheapy power supplies don't really measure up. If price is your concern get a low priced Seasonic or Corsair power supply. They can truly do what their specs say. A 300 watt power supply with 20 amps on the 12v rail would totally work in my system. But ... I got a 520 watt one anyway

 

[nanaki333]

i have a 5550 paired with a 45W x2 with a samsung f4 in a mini-itx rosewill case with 150W PSU and it never even hits the 100W mark.... so yeah...

 

[Termie]

i have a 5550 paired with a 45W x2 with a samsung f4 in a mini-itx rosewill case with 150W PSU and it never even hits the 100W mark.... so yeah...

He's talking about pairing a 95w processor with a higher-draw GPU. Not sure what your opinion was on that, but I'd say there's no way he won't go over 150w and potentially damage his PSU.

There's a new article today on AMD's replacement for the 5570 - you should check it out: http://www.anandtech.com/show/4278/amds-radeon-hd-6670-radeon-hd-6570

Basically, there are two new cards in the low-profile form: the 6570 and 6670. Both are more powerful than what you're considering.

But take a look at the power consumption of many of the low-power cards: http://www.anandtech.com/show/4278/amds-radeon-hd-6670-radeon-hd-6570/15. Even assuming that the i7-920 system consumes 50w more than your system at load, you're still coming very close to hitting 150w with a 5570.

I think the point is here, however, that you should actually consider the brand new 6450, not the 5450, as your card of choice: http://www.anandtech.com/show/4263/amds-radeon-hd-6450-uvd3-meets-htpc/5

 

[nanaki333]

he also said he undervolted it. if it's undervolted to 45W, then he won't have a problem. they make both tri core and quad core AMD chips that do 45W.

 

[LiuKangBakinPie]

You people seem to forget without knowing what the psu can output on the 12v rails we cant say forsure. That psu might be 150w and people somewhere might have measured 100w somewhere that a certain system pushed out but on what rails. 150w is the psu rated output but do we see that fully rated total normally? On cheaper psus they tend to put all the power on the lines that's not drawing lots of power. So the system might be using under that amount of power but the psu might not have enough juice to produce it coz it produces the power on the 3v lines and not on the 12v

 

[nanaki333]

You people seem to forget without knowing what the psu can output on the 12v rails we cant say forsure. That psu might be 150w and people somewhere might have measured 100w somewhere that a certain system pushed out but on what rails. 150w is the psu rated output but do we see that fully rated total normally? On cheaper psus they tend to put all the power on the lines that's not drawing lots of power. So the system might be using under that amount of power but the psu might not have enough juice to produce it coz it produces the power on the 3v lines and not on the 12v

he showed us what case and psu he is using. it's an antec 150


DC Output +5V +3.3V +12V -12V +5Vsb
Max. Output 10A 8A 10A 0.2A 1.5

 

[bart1975]

I would be willing to underclock my cpu from 3.1 to 2.8 Ghz and also underclock the 5570 by 150mhz on core and mem. Not sure if that would lover the power draw enough. My only other option is to go with a 5450 and use the Hybrid Crossfire.

 

[LiuKangBakinPie]

Well ain't that the ones that passes 12V from an external AC/DC power brick?

 

[nanaki333]

I would be willing to underclock my cpu from 3.1 to 2.8 Ghz and also underclock the 5570 by 150mhz on core and mem. Not sure if that would lover the power draw enough. My only other option is to go with a 5450 and use the Hybrid Crossfire.

i would drop the settings to the same spec as this roughly
http://www.tigerdirect.com/applicat...CODE=GOOGLEBASE&cm_mmc_o=VRqCjC7BBTkwCjCECjCE

also, from what i understand, you should make the changes using the fsb, not the multiplier. i may be wrong, but just moving down the multiplier will disable the use of cool 'n quiet to make the processor even slower when idle. use the default multiplier and find the ~2.4ghz sweet spot at about 1.25v with the fsb.

 

[LiuKangBakinPie]

I would be willing to underclock my cpu from 3.1 to 2.8 Ghz and also underclock the 5570 by 150mhz on core and mem. Not sure if that would lover the power draw enough. My only other option is to go with a 5450 and use the Hybrid Crossfire.

look for this Seasonic SS-200SFD type of units. Will fit inside you case easily

 

[LiuKangBakinPie]

he showed us what case and psu he is using. it's an antec 150


DC Output +5V +3.3V +12V -12V +5Vsb
Max. Output 10A 8A 10A 0.2A 1.5

well the ocp set for 10A. That's your cpu and gpu bit pushing it really

 

[dma0991]

I don't think you want to take the chance with that kind of low power that the PSU has to offer. From what I can tell your PSU has 120W max at the +12V rails and stressing it at 80-100% is not recommended especially if it is those 150W PSU that comes with HTPC cases. If your case could fit a standard ATX PSU, I think that would be the best course of action.

 

[bart1975]

Maybe there is another low power low profile gpu you guys could recommend that uses a 128 bit memory bus. I am only looking to spend about $70 for a video card. I just put this system together last week. I am looking for something with a little more oomph for playing games at 1024x768 or 1280x720.

 

[nanaki333]

could always get something like this http://www.newegg.com/Product/Produc...82E16817338045

or pick from http://www.newegg.com/Product/Produc...e=&srchInDesc=

if it's the same mini-ITX style that is. that'll give you piece of mind at least.

 

[LiuKangBakinPie]

The Xbox uses a 150w psu and everything is locked tight on it its barely cutting it.

Here's a gpu

http://newegg.com/Product/Product.as...82E16814161367

Psu

http://www.southbaypc.com/store/Pow..._BRONZE_Certified_Active_PFC_Power_Supply.asp

 

[bart1975]

I appreciate all the responses. I really have no intention of replacing the psu though.
I just want to safely max out my performance by just adding a video card. I might be able to get away with a 6450 it is only 27 watts. I would still have to underclock my cpu to 2.6-2.8 though.