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无意中在某论坛发现的，转过来
First up I'd like to thank michael999 for starting the original thread HERE
Alright, below is largely what michael999 had in his thread but with updated Wattages and cards, plus any other info I can find along the way.
*** Please, if you find any info related to this thread or more accurate wattage readings for cards please post the link in here so that I can update the list. ***
Right, on with the show!
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The Truth About Graphics Power Requirements V2
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Ok. There is much confusion as to how much power you actually need to run the new uber card, the answer is not as simple as first thought. It turns out many older cards use more power than the new ones. And the myth that NVIDIA suck more juice is a just that, a myth.
It seems that there are three main factors behind power consumption:
- Core/Mem clock speeds - Higher clocks equal higher power consumption. (eg look at the difference between the 7900 GTX & GT, both the same GPU and memory but the core and memory are clocked differently, producing a 36W difference. Similar story with the X1900XT/XTX)
- Die size/fabrication process (110nm/90nm etc) - Smaller process equals a smaller die, thus less power needed. For example look at the 7900 GTX, it's a 196 mm² die size while the X1900XTX is 352 mm², both are 90nm, and clocked almost exactly the same but the 7900 GTX draws 36W less.
- Amount and type of onboard RAM - Greater amounts of onboard RAM capacity mean greater power consumption. Also newer GDDR draws less power GDDR > GDDR2 > GDDR3 > GDDR4. (eg look at the difference between the X1900XT & X1900XT 256MB model, same in every way except capacity and GDDR3 vs GDDR4 respectively, which results in a 10W drop)
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GFX Card Comparison Table
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This table shows GFX cards power consumption, not what the recommended PSU requirements are, but rather the actual draw of the card. The graphs show max 3D power draw as well as idle and max 2D power draw where possible.
All readings have been found on the web, you can find where I got the details from by looking in the "source links" legend below the graphs. I'v provided a simple legend to help you find where it came from. (eg look for an *, ², ^ etc after each reading)
The measurments displayed after each bar on the graph are displayed as min power draw - max 2d power draw - max 3d power draw. If there's only two readings it's likely just min-max 3D, and if there's just the one reading it'll be the max 3d reading.
Last thing of note. I've tried to normalise all the readings found at the various websites against cards that have been properly tested for power draw (eg what xbitlabs mostly does), not just a generic total system score. This should hopefully provide more accurate results for cards with readings that are otherwise of not much use. Where I can't find proper readings from a website I've utilised http://www.extreme.outervision.com/psucalculator.jsp where possible, they're likely to be above actual wattage needed but are still quite accurate compared to TDP ratings from vendors.
NB: Some of the links might not be the only source of info in calculating the ratings
For nice and pretty picture versions check these out (kept up to date):
Charts sorted by peak 3D - http://mark.zoomcities.com/images/gfx/GFXpowerchartby3d.png
Charts sorted by idle - http://mark.zoomcities.com/images/gfx/GFXp...chartbyidle.png
Graph Legend
' = 1 Watt
| = 2 Watts
} = 4 Watts
# = 8 Watts
¦) = 8 Watts (idle draw mark)
¦] = 8 Watts (max 2D draw mark)
? = Rating yet to be obtained. Just a placeholder for the card.
* = The official "peak power consumption" (or TDP) from the manufacturer
ATI Multicard
HD4870X2 CF__________#################¦)############################################## 149W-512W
HD4870X2 + HD4870 CF_##################¦)################################| 150W-409W (HD4870 512MB)
HD4870 CF____________###############¦)###############}|' 128W-255W
HD4870 + HD4850 CF___###########¦)###############}' 96W-221W
HD4850 CF____________#########¦)##############}|' 78W-199W
HD4670 CF____________#####¦)#######}| 44W-110W
HD3870 X2 CF_________###########¦)#######################}|' 95W-307W
HD3870X2 + HD3870 CF_##########¦)################' 82W-225W
HD3870 CF____________####¦)###############|' 40W-163W
HD3850 CF____________####¦)############|' 40W-139W
HD2900 XT CF_________#############¦)########################| 105W-306W (2x 1GB GDDR4)
HD2900 XT CF_________###############¦)#########################|' 121W-331W (2x 512MB GDDR3)
X1950 XTX CF_________####¦)#####################|' 37W-211W
X1900 XTX CF_________#####¦)#####################' 43W-217W
X1900 XT CF__________###¦)###################}' 27W-189W
X1950 Pro CF_________##¦)##########}| 24W-110W
X1900 GT CF _________################|' 123W
X1800 XT CF__________######¦)##############|' 52W-171W
X1800 XL CF__________#######¦)##########}' 62W-149W
X1650 XT CF__________###¦)########}|' 25W-101W
X1600 XT CF__________#########}| 78W
X1600 PRO CF________########' 67W
X1300 PRO CF________#######} 60W
X850 XT CF___________##############|' 115W
X800 XL CF___________##########' 81W
[ 本帖最后由 Cerellean 于 2008-9-23 12:23 编辑 ] |
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发表于 2008-9-23 12:17
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