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Crossfire HD 7850 or upgrade to HD 7950 ? - Page 4

post #31 of 37
^ listen to TwoCables, I didn't calculate wattage for the Crossfire properly frown.gif

Makes sense since HIS OC HD 7850 crossfire only consumes ~480W total even if AMD asks for 600W on HD 7850 crossfire (stock clocks)
Edited by AlphaC - 3/1/13 at 11:39am
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post #32 of 37
Thread Starter 
I am listening to him, he helped me decide on my new PSU biggrin.gif

Order status is packaging on newegg. Probably won't have it until sometime next week though.
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AMD FX-8350 @ 4.6 GHz ASUS M5A99FX PRO XFX Double D Radeon HD 7850 2GB x2 in Crossfire... G.SKILL Ares 8GB (2 x 4GB) x2 (16GB total) 
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post #33 of 37
Quote:
Originally Posted by hatrix216 View Post

I think the PSU will supply enough amps, no doubt. It's rated @ 54 amps on the single 12v rail. Should be more than enough for my CPU and crossfire 7850s.

 

Yeah, that's 648W which is the typical +12V capacity of many high-end 650W power supplies.  Still, it's not a bad PSU, especially being a 750W modular PSU for $69.99 shipped thanks to the promo code!

 

 

Quote:
Originally Posted by AlphaC View Post

^ listen to TwoCables, I didn't calculate wattage for the Crossfire properly frown.gif

Makes sense since HIS OC HD 7850 crossfire only consumes ~480W total even if AMD asks for 600W on HD 7850 crossfire (stock clocks)

 

That's the total system power draw with two 7850s.  Although, 480W seems a bit high to me.  Where did you see 480W?

 

Also, and again, a 600W peak-rated PSU would have a continuous capacity of about 36 to 38A (432 to 456W).

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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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post #34 of 37
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182277

Would anyone recommend this power supply?
post #35 of 37
Quote:
Originally Posted by TwoCables View Post

That's the total system power draw with two 7850s.  Although, 480W seems a bit high to me.  Where did you see 480W?

Also, and again, a 600W peak-rated PSU would have a continuous capacity of about 36 to 38A (432 to 456W).
"Finishing off with power draw we can see we're just shy of 500 watts at load."
@ http://www.tweaktown.com/reviews/4798/his_radeon_hd_7850_iceq_x_turbox_2gb_in_crossfire_video_card_review/index17.html

They may be wrong
Quote:
Measured power consumption R7850

System in IDLE = 160W
System Wattage with GPU in FULL Stress = 256W
Difference (GPU load) = 96W
Add average IDLE wattage ~10W
Subjective obtained GPU power consumption = ~ 106 Watts
http://www.guru3d.com/articles-pages/amd-radeon-hd-7850-and-7870-review,7.html
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post #36 of 37
Thread Starter 
Quote:
Originally Posted by AlphaC View Post

"Finishing off with power draw we can see we're just shy of 500 watts at load."
@ http://www.tweaktown.com/reviews/4798/his_radeon_hd_7850_iceq_x_turbox_2gb_in_crossfire_video_card_review/index17.html

They may be wrong
http://www.guru3d.com/articles-pages/amd-radeon-hd-7850-and-7870-review,7.html

I read that crossfire review, and I believe the wattage they stated was for the whole systems power consumption, not just the cards. It does state they only run a single SSD, a single CD rom, and minimal case fans though.

But, I have no CD rom installed right now, only two HDDs, and only 3 case fans.
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AMD FX-8350 @ 4.6 GHz ASUS M5A99FX PRO XFX Double D Radeon HD 7850 2GB x2 in Crossfire... G.SKILL Ares 8GB (2 x 4GB) x2 (16GB total) 
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AMD FX-8350 @ 4.6 GHz ASUS M5A99FX PRO XFX Double D Radeon HD 7850 2GB x2 in Crossfire... G.SKILL Ares 8GB (2 x 4GB) x2 (16GB total) 
Hard DriveHard DriveOptical DriveCooling
Samsung 500GB 7200RPM Western Digital 320GB 5400RPM Sony RW Corsair H100i 
OSMonitorKeyboardPower
Windows 7 64-bit Samsung SyncMaster BX2331 GIGABYTE K8100 Gaming Keyboard Rosewill HIVE-750 750W 
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post #37 of 37
Quote:
Originally Posted by AlphaC View Post

Quote:
Originally Posted by TwoCables View Post

That's the total system power draw with two 7850s.  Although, 480W seems a bit high to me.  Where did you see 480W?

Also, and again, a 600W peak-rated PSU would have a continuous capacity of about 36 to 38A (432 to 456W).
"Finishing off with power draw we can see we're just shy of 500 watts at load."
@ http://www.tweaktown.com/reviews/4798/his_radeon_hd_7850_iceq_x_turbox_2gb_in_crossfire_video_card_review/index17.html

 

They are measuring the power draw of the entire computer system at the wall outlet while running 3DMark06.  Their testing equipment is the only thing between their PSU and the wall outlet.  Therefore, if their PSU is 85% efficient while pulling 488W from the wall outlet (from their testing equipment), then their computer system is pulling 414W from the PSU while running 3DMark06.

 

 

They may be wrong
Quote:
Measured power consumption R7850

System in IDLE = 160W
System Wattage with GPU in FULL Stress = 256W
Difference (GPU load) = 96W
Add average IDLE wattage ~10W
Subjective obtained GPU power consumption = ~ 106 Watts
http://www.guru3d.com/articles-pages/amd-radeon-hd-7850-and-7870-review,7.html

 

So no, they weren't wrong.  Their CPU was idling during this test, so let's add 150W for the average CPU overclocked pretty high.  Also, we have to add 106W to the 256W power draw for Crossfire.  So, 256+106+150 = 512W.  If the PSU is 85% efficient while pulling 512W from the wall outlet, then the computer system is pulling 435W from the PSU.

 

Any questions?  :)

It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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