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World Community Grid Forums
Category: Completed Research
Forum: Help Conquer Cancer
Thread: Any point to continuing with CPU version? |
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Thread Status: Active Total posts in this thread: 42
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l_mckeon
Senior Cruncher Joined: Oct 20, 2007 Post Count: 439 Status: Offline Project Badges: 
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Personally, if continued CPU processing ends this project 1 day earlier, and gets the results to the scientists 1 day earlier, I'm all for that! It might mean a cure 1 day sooner! But the same CPU power, if diverted, might have cured HIV a month earlier, that being a project which doesn't have a GPU option. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
One point that hasn't been mentioned regarding GPU "efficiency." They use a LOT of power. The top end GPU's require 400 to 800 Watt power supplies. My puny low end GPU card (13 min/ wu) allows me to operate with a 300 Watt power supply, but I am getting close to the limit. If I added a second internal HD, as well as as an external HD, and then installed a 3.0 USB card in my extra PCIe slot I would be worried about my computers stability.
A single PCIe slot can supply up to 75W to a card. Each 6pin power connector can supply up to an additional 75W Each 8pin power connector can supply up to an additional 150W Feeling better about those CPU's now?  |
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Jim1348
Veteran Cruncher USA Joined: Jul 13, 2009 Post Count: 1066 Status: Offline Project Badges: 
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One point that hasn't been mentioned regarding GPU "efficiency." They use a LOT of power. The top end GPU's require 400 to 800 Watt power supplies. My puny low end GPU card (13 min/ wu) allows me to operate with a 300 Watt power supply, but I am getting close to the limit. If I added a second internal HD, as well as as an external HD, and then installed a 3.0 USB card in my extra PCIe slot I would be worried about my computers stability. My AMD Radeon HD 7770 is getting around 100,000 ppd on less than 20 watts (plus another 5 to 10 watts for CPU support). https://secure.worldcommunitygrid.org/forums/...ead,34055_offset,0#396680 I run two of them (the other one is on POEM) with a 330 watt Seasonic power supply. I don't think you will see that on a CPU. The CPUs should be reserved for the projects that don't have GPU versions, as other have noted. It is as simple as that. [Edit 1 times, last edit by Jim1348 at Oct 26, 2012 2:59:02 AM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Reminds me of the story of the two bulls, one young, one old...
Just how does the 10-20 cpu wu I do a day hurt you? As for other projects, they have increased the run time on them to the point of if you are not on 24/7 they can take days JUST so YOU can have more, as far as I am concerned, get this project done so we can get some work done. |
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mmstick
Senior Cruncher Joined: Aug 19, 2010 Post Count: 151 Status: Offline Project Badges:
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One point that hasn't been mentioned regarding GPU "efficiency." They use a LOT of power. The top end GPU's require 400 to 800 Watt power supplies. My puny low end GPU card (13 min/ wu) allows me to operate with a 300 Watt power supply, but I am getting close to the limit. If I added a second internal HD, as well as as an external HD, and then installed a 3.0 USB card in my extra PCIe slot I would be worried about my computers stability. A single PCIe slot can supply up to 75W to a card. Each 6pin power connector can supply up to an additional 75W Each 8pin power connector can supply up to an additional 150W Feeling better about those CPU's now? Implying GPU = CPU level of output. GPU's aren't THAT power hungry. My 7950 might consume maybe 200 watts when on 100%, now calculate how many CPUs it would take to equal the same level of output? Considering I would need around maybe 40 machines with highly overclocked 6 core processors to equal the same as this 200W GPU, and these CPUs might consume ~100 watts for each processor. feeling better about those GPUs now? Seriously now, buy yourself a better power supply and stop worrying, power supplies aren't that expensive, you spend more on a hard drive. [Edit 1 times, last edit by mmstick at Oct 26, 2012 7:42:04 AM] |
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mmstick
Senior Cruncher Joined: Aug 19, 2010 Post Count: 151 Status: Offline Project Badges:
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Reminds me of the story of the two bulls, one young, one old... Just how does the 10-20 cpu wu I do a day hurt you? As for other projects, they have increased the run time on them to the point of if you are not on 24/7 they can take days JUST so YOU can have more, as far as I am concerned, get this project done so we can get some work done. To the point where I average 750-1500 work units pending validation at all times, but there is a decent amount of work units available recently, shortage isn't too bad. But I can complete the maximum work units they allow a person to have at any given time in well under an hour. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
My AMD Radeon HD 7770 is getting around 100,000 ppd on less than 20 watts (plus another 5 to 10 watts for CPU support). I run two of them (the other one is on POEM) with a 330 watt Seasonic power supply. I don't think you will see that on a CPU. Thank you for your reply. You provide a lot of useful information. First I never claimed there was NO advantage to crunching with a GPU. I just wanted to point out one limit. Perhaps I should have said "People who were unaware of the power requirements of top-of-the-line graphics cards should feel better about their CPU's"? Second: Apparently results vary. I get about 20% less points per hour using my CPU:[ Intel Core i5-2500 quad-core (95 Watts), 3.3 GHz ] as I do with my GeForce GT 240 Graphics Card [Max Power 69 Watts ]. That does indicate an efficiency advantage for the GPU but not a overwhelming advantage. [ ~ 69 Watts (plus whatever one CPU uses)] VS [~ 95 Watts ( minus whatever one cpu uses ) and ( ~20% less points)]. Surprise! I am now suddenly interested in a HD 7770 or maybe just a Watt meter. I have a stock HP computer, so I don't have an efficient power supply, but I also don't have a second graphics card! My power supply does have a six pin power connector. I don't have a watt meter and tend to follow manufacturers recommendations. Is a decent Watt meter very expensive? EDIT NOTE: I was reading the reviews for the HD 7770 and read that "AMD recommends a 500 watt PSU for this card"! The reviewer suggests, like you do, that this may be "because they are lots of poorly made PSU's out there," but then adds "it runs just fine on my 460 watt PSU"! Perhaps part of the problem is the manufacturers are exaggerating the wattage requirements. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102967 [Edit 2 times, last edit by Former Member at Oct 27, 2012 8:06:00 PM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Is a decent Watt meter very expensive? You don't need a desent one, regular would be fine :) I think it's about 10$. |
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Crystal Pellet
Veteran Cruncher Joined: May 21, 2008 Post Count: 1316 Status: Recently Active Project Badges: 
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EDIT NOTE: I was reading the reviews for the HD 7770 and read that "AMD recommends a 500 watt PSU for this card"! The reviewer suggests, like you do, that this may be "because they are lots of poorly made PSU's out there," but then adds "it runs just fine on my 460 watt PSU"! Perhaps part of the problem is the manufacturers are exaggerating the wattage requirements. I've a similar machine as you, i7 2600 not overclocked, 2 Hard disks, running 8 cores (1 to support the HCC GPU-task) and a 7770 default clockrate. I've a Wattmeter connected all the time. The average load is between 120-150W full crunching and the maximum load observed during all that days was 170W. Make your conclusion.  |
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mmstick
Senior Cruncher Joined: Aug 19, 2010 Post Count: 151 Status: Offline Project Badges:
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My AMD Radeon HD 7770 is getting around 100,000 ppd on less than 20 watts (plus another 5 to 10 watts for CPU support). I run two of them (the other one is on POEM) with a 330 watt Seasonic power supply. I don't think you will see that on a CPU. Thank you for your reply. You provide a lot of useful information. First I never claimed there was NO advantage to crunching with a GPU. I just wanted to point out one limit. Perhaps I should have said "People who were unaware of the power requirements of top-of-the-line graphics cards should feel better about their CPU's"? Second: Apparently results vary. I get about 20% less points per hour using my CPU:[ Intel Core i5-2500 quad-core (95 Watts), 3.3 GHz ] as I do with my GeForce GT 240 Graphics Card [Max Power 69 Watts ]. That does indicate an efficiency advantage for the GPU but not a overwhelming advantage. [ ~ 69 Watts (plus whatever one CPU uses)] VS [~ 95 Watts ( minus whatever one cpu uses ) and ( ~20% less points)]. Surprise! I am now suddenly interested in a HD 7770 or maybe just a Watt meter. I have a stock HP computer, so I don't have an efficient power supply, but I also don't have a second graphics card! My power supply does have a six pin power connector. I don't have a watt meter and tend to follow manufacturers recommendations. Is a decent Watt meter very expensive? EDIT NOTE: I was reading the reviews for the HD 7770 and read that "AMD recommends a 500 watt PSU for this card"! The reviewer suggests, like you do, that this may be "because they are lots of poorly made PSU's out there," but then adds "it runs just fine on my 460 watt PSU"! Perhaps part of the problem is the manufacturers are exaggerating the wattage requirements. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102967 First: Um HELLO? Did you ignore my comment? ONE HD 7950 consumes 200 watts of power, my CPU consumes 150watts of power. My CPU working by itself only gets maybe 23,000PPD. That 7950 earns 700,000PPD with using both my 150 watt CPU and my 200 watt GPU. Shall we do the math here? While I use a graphics card I get 2,000 PPD per watt day. While I use a CPU alone, I get 153 PPD per watt day I'm sorry, but GPUs are FAR more power efficient at what they do. Second: You aren't too familiar with graphics cards I take it. All graphics cards will say that you need much more power than you actually do. It's not exaggeration, but it's so that you will have headroom which is more efficient. If you have a POS power supply, it has absolutely no kind of protection, it has really terrible efficiency, and the closer you get to the max watt the power supply can give, the more inefficient it becomes, and the more likely your power supply will get worn out and fall apart within a few months from being overloaded. If you buy a good quality, high watt power supply, you will consume less watts, have tons of headroom, and lots of electrical protection. [Edit 3 times, last edit by mmstick at Oct 28, 2012 2:42:02 AM] |
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