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Kevin
A friend of mine told me that when purchasing a new computer it is also important to pay attention to the power supply in the computer. In particular to make sure it is enough to run your video card. One thing I have noticed however when looking through Dell computers and other brand name computers they have lower wattage power supplies then recommended for those types of cards.
For example I was looking at an alienware computer that has a NVIDIA GeForce GTX 660 1.5gb memory in it. When looking at the power supply it is only 330 watts. However when you search individual cards they all recommend between 450 watts to 600 watts. So I was wondering how is this possible?
Here is that specific computer I wasnât planning on buying it but just using it as an example for now: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7750340&Sku=A211-G2100
Any further details would be much appreciated.
Answer
It's a really interesting question. The bottom line is that Alienware's X51 models don't have standard internal ATX power supplies, they have external power bricks like laptops- and those are actually more efficient.
With standard desktop power supplies, not all of the power is available in one big pool- power is split among different lines or rails, the most important being the +12V rail- that's where graphics cards draw power from. Some PSU models have dual +12V rails, some have a single rail but that's all irrelevant for purposes of this discussion.
Let's look at Corsair's 500W power supply:
http://static.pcinpact.com/images/bd/news/90084-corsair-builder-series.jpg
The important thing is 34 amps (or 408 watts) available on the +12V rail.
In contrast, this cheap 575W power supply from Logisys only supports 25 amps on the +12V rail, so despite a higher advertised rating of 575 watts, it's actually weaker than Corsair's 500 watt unit.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817170017
Even Corsair's 430 watt unit is better (28 amps on +12V) than Logisys' 575W doorstop. The build quality is also much lower than Corsair- cheap made in China capacitors and so forth. So when shopping for desktop power supplies, +12V capacity and quality are of primary importance, moreso than the advertised total wattage rating.
http://www.eggxpert.com/forums/thread/323050.aspx
In general, factory power supplies in brand-name computers are mediocre at best, and often poor. Major computer manufacturers typically use the cheapest power supply they can get away with in their stock builds- it's a primary way they keep their production cost down. So the included PSU in a Dell/HP/Gateway etc is enough for the configuration as they shipped it (usually with integrated graphics or a low-end card) but not strong enough to handle any substantial upgrades. Most gamers buying a stock tower to upgrade will need to replace the factory PSU.
The other thing to keep in mind is that card manufacturer's recommendations tend to be on the high side, and their numbers assume standard ATX power supplies of average quality. For example, Nvidia recommends at least a 450W power supply to run a GTX 660. But that 450W includes the power draw from everything in a typical system- CPU, RAM, hard drive etc. The GTX 660 by itself only draws a maximum of 140 watts.
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-660/specifications
Now Alienware's external power supply is something called a picoPSU - it's a different type of technology but basically there's a lot more power available on +12V compared to conventional power supplies. So the 330W rating is really misleading.
http://www.silentpcreview.com/article601-page1.html
http://www.jonnyguru.com/forums/showthread.php?p=96836#post96836
Now according to Dell/Alienware's sales pitch, it's magic- total power draw below 276 watts (1:01 mark in the video) etc. although I think their numbers reflect power usage at the Windows desktop, not when the card is running in 3D mode. It's also possible that Alienware is using special low-power consumption versions of cards they include- the standard GTX 660 is 2GB. Anyway, their external PSUs do indeed support the configurations they ship.
http://www.youtube.com/watch?v=1WrpXdREZio
However it's still not a recommended way to go. The smaller chassis means less airflow and a greater likelihood of components overheating. The proprietary external power bricks severely limit any further upgrades. For example, you really can't install a GTX 680- and yes, some lab testers have tried:
http://www.gamespot.com/features/the-alienware-x51-and-nvidia-gtx-680-a-match-made-in-heaven-6369912/
Also keep in mind that proprietary mean greater expense if that external PSU fails- you can't just order a replacement from Newegg, you're stuck paying Alienware whatever they charge for it.
It's a really interesting question. The bottom line is that Alienware's X51 models don't have standard internal ATX power supplies, they have external power bricks like laptops- and those are actually more efficient.
With standard desktop power supplies, not all of the power is available in one big pool- power is split among different lines or rails, the most important being the +12V rail- that's where graphics cards draw power from. Some PSU models have dual +12V rails, some have a single rail but that's all irrelevant for purposes of this discussion.
Let's look at Corsair's 500W power supply:
http://static.pcinpact.com/images/bd/news/90084-corsair-builder-series.jpg
The important thing is 34 amps (or 408 watts) available on the +12V rail.
In contrast, this cheap 575W power supply from Logisys only supports 25 amps on the +12V rail, so despite a higher advertised rating of 575 watts, it's actually weaker than Corsair's 500 watt unit.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817170017
Even Corsair's 430 watt unit is better (28 amps on +12V) than Logisys' 575W doorstop. The build quality is also much lower than Corsair- cheap made in China capacitors and so forth. So when shopping for desktop power supplies, +12V capacity and quality are of primary importance, moreso than the advertised total wattage rating.
http://www.eggxpert.com/forums/thread/323050.aspx
In general, factory power supplies in brand-name computers are mediocre at best, and often poor. Major computer manufacturers typically use the cheapest power supply they can get away with in their stock builds- it's a primary way they keep their production cost down. So the included PSU in a Dell/HP/Gateway etc is enough for the configuration as they shipped it (usually with integrated graphics or a low-end card) but not strong enough to handle any substantial upgrades. Most gamers buying a stock tower to upgrade will need to replace the factory PSU.
The other thing to keep in mind is that card manufacturer's recommendations tend to be on the high side, and their numbers assume standard ATX power supplies of average quality. For example, Nvidia recommends at least a 450W power supply to run a GTX 660. But that 450W includes the power draw from everything in a typical system- CPU, RAM, hard drive etc. The GTX 660 by itself only draws a maximum of 140 watts.
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-660/specifications
Now Alienware's external power supply is something called a picoPSU - it's a different type of technology but basically there's a lot more power available on +12V compared to conventional power supplies. So the 330W rating is really misleading.
http://www.silentpcreview.com/article601-page1.html
http://www.jonnyguru.com/forums/showthread.php?p=96836#post96836
Now according to Dell/Alienware's sales pitch, it's magic- total power draw below 276 watts (1:01 mark in the video) etc. although I think their numbers reflect power usage at the Windows desktop, not when the card is running in 3D mode. It's also possible that Alienware is using special low-power consumption versions of cards they include- the standard GTX 660 is 2GB. Anyway, their external PSUs do indeed support the configurations they ship.
http://www.youtube.com/watch?v=1WrpXdREZio
However it's still not a recommended way to go. The smaller chassis means less airflow and a greater likelihood of components overheating. The proprietary external power bricks severely limit any further upgrades. For example, you really can't install a GTX 680- and yes, some lab testers have tried:
http://www.gamespot.com/features/the-alienware-x51-and-nvidia-gtx-680-a-match-made-in-heaven-6369912/
Also keep in mind that proprietary mean greater expense if that external PSU fails- you can't just order a replacement from Newegg, you're stuck paying Alienware whatever they charge for it.
Why does my face skin turn too dry and peel out in Winter ? Is it a vitamin deficiency?
Sama A
Noting that i use the best brand names moisturizers.
Answer
Because the air in your home and your job is so much dryer. The heat sucks the moisture out of the air and its rough on the skin. First...buy a humidifier. Not only will it improve your skin...but it makes breathing much nicer since the air doesn't dry you out as much inside. Second...buy some Cetaphil. Forget all those name brand products that are supposed to be so great. I have the softest, smoothest skin you will ever feel. People actually ask to touch me just because it looks so smooth...and then lose it when they feel it and its so buttery...and Cetaphil is the answer. A dermatologist gave it to me years ago because I have very bad eczema...I've had it since I was a toddler. Since she gave me the sample about nine or ten years ago, I have used nothing else...and you can't see a trace of eczema on me...anywhere. I haven't used any prescription products for eczema since about two weeks after I first got those samples.
I put the Cetaphil on in the morning...and I stay completely moisturized all day...no matter what the season is. I never use anything else...and I advise everyone I know to buy it. It literally changed my life. My eczema was terrible. My skin would dry so badly that it would crack and bleed. NEVER HAPPENS NOW. NEVER. Not only is there no eczema on my skin...but I have skin that feels like the skin of a baby...smooth and silky. What more could you want from a moisturizer.
Cetaphil comes in round plastic jars that are white and have blue lids. You can get it at the pharmacy or at Wal-mart or Sam's Club. Its not as cheap as the average moisturizer, but its less expensive than the high end stuff...and a little bit goes a long long way...so its worth every cent you pay for it. If you go buy some you will not be disappointed...I promise.
Oh...and Yakuza is right...drink plenty of water and watch the water temp in the shower. Water sucks the oils out of yoru skin...so you gotta lube up after a shower.
Because the air in your home and your job is so much dryer. The heat sucks the moisture out of the air and its rough on the skin. First...buy a humidifier. Not only will it improve your skin...but it makes breathing much nicer since the air doesn't dry you out as much inside. Second...buy some Cetaphil. Forget all those name brand products that are supposed to be so great. I have the softest, smoothest skin you will ever feel. People actually ask to touch me just because it looks so smooth...and then lose it when they feel it and its so buttery...and Cetaphil is the answer. A dermatologist gave it to me years ago because I have very bad eczema...I've had it since I was a toddler. Since she gave me the sample about nine or ten years ago, I have used nothing else...and you can't see a trace of eczema on me...anywhere. I haven't used any prescription products for eczema since about two weeks after I first got those samples.
I put the Cetaphil on in the morning...and I stay completely moisturized all day...no matter what the season is. I never use anything else...and I advise everyone I know to buy it. It literally changed my life. My eczema was terrible. My skin would dry so badly that it would crack and bleed. NEVER HAPPENS NOW. NEVER. Not only is there no eczema on my skin...but I have skin that feels like the skin of a baby...smooth and silky. What more could you want from a moisturizer.
Cetaphil comes in round plastic jars that are white and have blue lids. You can get it at the pharmacy or at Wal-mart or Sam's Club. Its not as cheap as the average moisturizer, but its less expensive than the high end stuff...and a little bit goes a long long way...so its worth every cent you pay for it. If you go buy some you will not be disappointed...I promise.
Oh...and Yakuza is right...drink plenty of water and watch the water temp in the shower. Water sucks the oils out of yoru skin...so you gotta lube up after a shower.
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Title Post: How does video card power usage requirements work?
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Rating: 98% based on 9457 ratings. 4,7 user reviews.
Author: Unknown
Thanks For Coming To My Blog
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