PSU requirement inquiry, can it handle the load?

Sempron Guy · Jan 21, 2014

I've been mining coins with my HD7950 lately, and I'm planning to add in two more R9-270s. My specs are as follows:

Sempron 145 underclocked/undervolted @ 800mhz 1v
Asus CHV
Crucial M4
2 fans
generic 4GB DDR3 ram
Corsair CS750M 80+ Gold

I'm somewhat certain that it can accommodate two more R9-270s. But I just need a second opinion just to be sure. I calculated it quick using an online psu calculator and it totals just around 550w. Now my HD7950 is slightly overclocked to 975mhz from stock 800mhz with a .01 increment on voltage. I'm planning to oc the 270s to 270x speed. Is my psu sufficient? If it is, is it ok to run it at around 80-85% load all the time?

Sasqui · Jan 21, 2014

HD 7950 Max 200w http://www.techpowerup.com/reviews/Sapphire/HD_7950_Vapor-X/26.html
270 Max 226w (each) http://www.techpowerup.com/reviews/MSI/R9_270X_Gaming/22.html

You're already at 650 right there.... worse case load.

Sempron Guy · Jan 21, 2014

Sasqui said:
HD 7950 Max 200w http://www.techpowerup.com/reviews/Sapphire/HD_7950_Vapor-X/26.html
270 Max 226w (each) http://www.techpowerup.com/reviews/MSI/R9_270X_Gaming/22.html

You're already at 650 right there.... worse case load.

I'm talking about the 270 non-x btw, I think I could live with running both of them on stock.

Sasqui · Jan 21, 2014

Sempron Guy said:
I'm talking about the 270 non-x btw, I think I could live with running both of them on stock.

Ah... 270 peak at 138w here: http://www.techpowerup.com/reviews/ASUS/R9_270_Direct_Cu_II_OC/24.html

Still, theoretical max at near 500w, not a lot of headroom. Keep your nose tuned into burning smell

I once used a 250w dell PSU for a bench build and it ran but man could you smell hot electronics

Sempron Guy · Jan 21, 2014

what's the recommended load for psus? 50%? thanks for the heads up btw

Blue-Knight · Jan 21, 2014

Sempron Guy said:
what's the recommended load for psus?

70-80%. Full load.

Happy New Year!

TRWOV · Jan 21, 2014

50% load will give you the maximum efficiency

Blue-Knight · Jan 21, 2014

TRWOV said:
50% load will give you the maximum efficiency

That's because they didn't test 70%-80%.

Not sure, just another stupid random opinion.

ZetZet · Jan 21, 2014

Blue-Knight said:
That's because they didn't test 70%-80%.

Not sure, just another stupid random opinion.

Its almost always a curve where 50% is peak.
http://tpucdn.com/reviews/Corsair/AX860i/images/efficiency.jpg Like this one

System Name	Salamander
Processor	Ryzen 5 3600 @ 4.325ghz 1.206v
Motherboard	Asrock X370 Taichi
Cooling	EK Supremacy Evo \| Black Ice Nemesis 360GTS XFlow \| Noiseblocker BlackSilent Pro 120mm x 3
Memory	Team T-Force Xtreem 2x8GB DDR4 3733 @ 3733mhz c16 1.4v \| IF @ 1866mhz
Video Card(s)	XFX RX-470 RS Single Fan flashed to RX-570 @ stock water-cooled
Storage	Samsung 850 Evo 256gb M.2 \| Crucial M4 128GB \| WD Blue 1TB \| WD Blue 500GB 2.5" \| Toshiba 2TB 2.5"
Display(s)	LG 27MP68VQ 27" 1920x1080 75hz IPS Freesync monitor
Case	Fractal Design Define C
Audio Device(s)	onboard
Power Supply	Seasonic Prime Gold 650w
Mouse	Steelseries Kana White
Keyboard	Steelseries 6GV2 Cherry MX Black
Software	Windows 10 Pro N

System Name	Senile
Processor	I7-4790K@4.8 GHz 24/7
Motherboard	MSI Z97-G45 Gaming
Cooling	Be Quiet Pure Rock Air
Memory	16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card(s)	GIGABYTE Vega 64
Storage	Samsung EVO 500GB / 8 Different WDs / QNAP TS-253 8GB NAS with 2x10Tb WD Blue
Display(s)	34" LG 34CB88-P 21:9 Curved UltraWide QHD (34401440) FREE_SYNC*
Case	Rosewill
Audio Device(s)	Onboard + HD HDMI
Power Supply	Corsair HX750
Mouse	Logitech G5
Keyboard	Corsair Strafe RGB & G610 Orion Red
Software	Win 10

System Name	Salamander
Processor	Ryzen 5 3600 @ 4.325ghz 1.206v
Motherboard	Asrock X370 Taichi
Cooling	EK Supremacy Evo \| Black Ice Nemesis 360GTS XFlow \| Noiseblocker BlackSilent Pro 120mm x 3
Memory	Team T-Force Xtreem 2x8GB DDR4 3733 @ 3733mhz c16 1.4v \| IF @ 1866mhz
Video Card(s)	XFX RX-470 RS Single Fan flashed to RX-570 @ stock water-cooled
Storage	Samsung 850 Evo 256gb M.2 \| Crucial M4 128GB \| WD Blue 1TB \| WD Blue 500GB 2.5" \| Toshiba 2TB 2.5"
Display(s)	LG 27MP68VQ 27" 1920x1080 75hz IPS Freesync monitor
Case	Fractal Design Define C
Audio Device(s)	onboard
Power Supply	Seasonic Prime Gold 650w
Mouse	Steelseries Kana White
Keyboard	Steelseries 6GV2 Cherry MX Black
Software	Windows 10 Pro N

System Name	Senile
Processor	I7-4790K@4.8 GHz 24/7
Motherboard	MSI Z97-G45 Gaming
Cooling	Be Quiet Pure Rock Air
Memory	16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card(s)	GIGABYTE Vega 64
Storage	Samsung EVO 500GB / 8 Different WDs / QNAP TS-253 8GB NAS with 2x10Tb WD Blue
Display(s)	34" LG 34CB88-P 21:9 Curved UltraWide QHD (34401440) FREE_SYNC*
Case	Rosewill
Audio Device(s)	Onboard + HD HDMI
Power Supply	Corsair HX750
Mouse	Logitech G5
Keyboard	Corsair Strafe RGB & G610 Orion Red
Software	Win 10

System Name	Salamander
Processor	Ryzen 5 3600 @ 4.325ghz 1.206v
Motherboard	Asrock X370 Taichi
Cooling	EK Supremacy Evo \| Black Ice Nemesis 360GTS XFlow \| Noiseblocker BlackSilent Pro 120mm x 3
Memory	Team T-Force Xtreem 2x8GB DDR4 3733 @ 3733mhz c16 1.4v \| IF @ 1866mhz
Video Card(s)	XFX RX-470 RS Single Fan flashed to RX-570 @ stock water-cooled
Storage	Samsung 850 Evo 256gb M.2 \| Crucial M4 128GB \| WD Blue 1TB \| WD Blue 500GB 2.5" \| Toshiba 2TB 2.5"
Display(s)	LG 27MP68VQ 27" 1920x1080 75hz IPS Freesync monitor
Case	Fractal Design Define C
Audio Device(s)	onboard
Power Supply	Seasonic Prime Gold 650w
Mouse	Steelseries Kana White
Keyboard	Steelseries 6GV2 Cherry MX Black
Software	Windows 10 Pro N

System Name	BlueKnight
Processor	Intel Celeron G1610 @ 2.60GHz
Motherboard	Gigabyte GA-H61M-S2PH (rev. 1.0)
Memory	1x 4GB DDR3 @ 1333MHz (Kingston KVR13N9S8/4)
Video Card(s)	Onboard
Storage	1x 160GB (Western Digital WD1600AAJS-75M0A0)
Display(s)	1x 20" 1600x900 (PHILIPS 200VW9FBJ/78)
Case	μATX Case (Generic)
Power Supply	300W (Generic)
Software	Debian GNU/Linux 8.7 (jessie)

System Name	Dell-y Driver
Processor	Core i5-10400
Motherboard	Asrock H410M-HVS
Cooling	Intel 95w stock cooler
Memory	2x8 A-DATA 2999Mhz DDR4
Video Card(s)	UHD 630
Storage	1TB WD Green M.2 - 4TB Seagate Barracuda
Display(s)	Asus PA248 1920x1200 IPS
Case	Dell Vostro 270S case
Audio Device(s)	Onboard
Power Supply	Dell 220w
Software	Windows 10 64bit