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Thread: Can you do more with less? 134.5 Floating Point MIPS/W.... still tweaking |
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Thread Status: Active Total posts in this thread: 158
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kateiacy
Veteran Cruncher USA Joined: Jan 23, 2010 Post Count: 1027 Status: Offline Project Badges: 
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I can't wait to see the reports when Bulldozer comes out.
----------------------------------------I suspect that skgiven is exactly right that these chips will be great for some kinds of crunching and terrible for others. That's certainly what I see with my netbook with the AMD Fusion E350 chip. It is twice as fast as my Atoms at C4CW (64 bit) and HCC, but comparable to the Atoms at other sciences.  |
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David Autumns
Ace Cruncher UK Joined: Nov 16, 2004 Post Count: 11062 Status: Offline Project Badges:
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sk..
Master Cruncher http://s17.rimg.info/ccb5d62bd3e856cc0d1df9b0ee2f7f6a.gif Joined: Mar 22, 2007 Post Count: 2324 Status: Offline Project Badges: 
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Three PCIE slots makes it a good board for me
---------------------------------------- Looking forward to seeing some real BD benchmarks; I think it will be very competitive, but perhaps doing better at some and not so great at other apps. Relative to the present SB processors it should fair well. We need high end competition. It's been a while but hopefully BD will put AMD at the top of the pile, if only for a few months. When the 130W SB processors come out Intel will probably re-establish itself as king of the hill, but AMD will traditionally squeeze out processors with higher clocks and cores following their initial releases. Intel's move to Quad channel memory will be particularly helpful for some projects. On the present SB's, Using CPUID HWMonitorPro I noticed that while the TDP of an i7-2600K is 95W, in reality it only uses between 60 and 65W when crunching at 100% (HT on). So I guess you could build a system with one of these that uses less than 100W. I have a big GPU, so there would be little point in measuring actual draw at the wall, even if I could find my power meter  - Benchmark results: Number of CPUs: 7 3428 floating point MIPS (Whetstone) per CPU 11331 integer MIPS (Dhrystone) per CPU So, I guess you could get about 3428X8/100=274 Fl Pt. MIPS/W [Edit 2 times, last edit by skgiven at May 21, 2011 3:16:33 PM] |
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges: 
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On the present SB's, Using CPUID HWMonitorPro I noticed that while the TDP of an i7-2600K is 95W, in reality it only uses between 60 and 65W when crunching at 100% (HT on). Are you sure about that? I did testing on several 2600k chips and at stock settings they pulled 130-135 watts at the wall at 100% with HT on according to my meter.
In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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David Autumns
Ace Cruncher UK Joined: Nov 16, 2004 Post Count: 11062 Status: Offline Project Badges:
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One of those Internet rumours - the type that has UK Footballers in a spin
---------------------------------------- The FX-8110 which is the 8 Core 95W TDP upcoming AMD Bulldozer CPU's .... 3.6Ghz Turbo Clocked to 4Ghz In the US it will sell for $290 3.6Ghz * 8 = 28.8Ghz in the same power envelope as the 1055T 18Ghz for 95W TDP mmm you have love progress All just hearsay and conjecture with no real value until we see it at launch Intriguing the potential nonetheless |
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sk..
Master Cruncher http://s17.rimg.info/ccb5d62bd3e856cc0d1df9b0ee2f7f6a.gif Joined: Mar 22, 2007 Post Count: 2324 Status: Offline Project Badges:
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On the present SB's, Using CPUID HWMonitorPro I noticed that while the TDP of an i7-2600K is 95W, in reality it only uses between 60 and 65W when crunching at 100% (HT on). Are you sure about that? I did testing on several 2600k chips and at stock settings they pulled 130-135 watts at the wall at 100% with HT on according to my meter. Not sure; still can't find my meter, but HWMonitorPro says 60 to 65W and I would go along with that, given the heat and fan speed. Turbo off, but clock tweaked up. Anand say's 86W, but that's with turbo left on, and Turbo a big power user. Here it's suggested that the 2600K only uses 87W at 4.5GHz. |
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges:
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On the present SB's, Using CPUID HWMonitorPro I noticed that while the TDP of an i7-2600K is 95W, in reality it only uses between 60 and 65W when crunching at 100% (HT on). Are you sure about that? I did testing on several 2600k chips and at stock settings they pulled 130-135 watts at the wall at 100% with HT on according to my meter. Not sure; still can't find my meter, but HWMonitorPro says 60 to 65W and I would go along with that, given the heat and fan speed. Turbo off, but clock tweaked up. Anand say's 86W, but that's with turbo left on, and Turbo a big power user. Here it's suggested that the 2600K only uses 87W at 4.5GHz. It seems Anands' readings are for the CPU only which I find very hard to believe. IMHO there is no way a software program will be as accurate as a hardware meter. The 3 chips I tested at 4.5 GHz. all showed a power draw near 200 watts at the wall socket and my electric bill tends to confirm that. Even at idle when the CPU downclocks to 1.6GHz. and the vcore is .9v my meter still shows a 50 watt draw. The only possible way I could see an 87watt CPU draw at 4.5Ghz is with HT off. Ask some of the guys at xtreme systems who run 2600k chips and have a meter. I think you'll find that near 200 watts at 4.5GHz. is the norm.
In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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sk..
Master Cruncher http://s17.rimg.info/ccb5d62bd3e856cc0d1df9b0ee2f7f6a.gif Joined: Mar 22, 2007 Post Count: 2324 Status: Offline Project Badges:
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I'm talking about the CPU using 65W, not the entire computer system
It's common for some CPU's (and GPU's) to display a noticeably higher TDP than a given processor actually has, or even the average processor. They have to allow for the occasional odd processor, some deterioration and their very average stock cooler. Most motherboards come with Temperature and Voltage sensing, so anything that can read this will be quite accurate (to ~1%). While the entire system might use 200W @ 4.5GHz, I doubt the CPU would be using anything like that; it's only a 1GHz OC on a 32nm CPU. So dvast8n's 87W sounds about right. Even a 65nm Q6600 can OC by 1GHz, and there is no way that calls for 200W just for the CPU. |
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges:
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If the CPU is only using 87 watts what would account for the other 113 watts? I run low end video cards (4350 or 210s that do no folding) 3 fans, 1 HDD and no monitor 95% of the time.
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In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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sk..
Master Cruncher http://s17.rimg.info/ccb5d62bd3e856cc0d1df9b0ee2f7f6a.gif Joined: Mar 22, 2007 Post Count: 2324 Status: Offline Project Badges:
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If the CPU is only using 87 watts what would account for the other 113 watts? I run low end video cards (4350 or 210s that do no folding) 3 fans, 1 HDD and no monitor 95% of the time. The other components:An uneconomic motherboard could use as much as 50W more than an economic motherboard, so which one do you have? When idle a reasonably efficient SB motherboard might use around 30W, but when the system is in use the motherboards power consumption could easily rise by 30W or 40W. Overclocked this could be much more. RAM ~ 10W GPU ~ 10W 3 fans ~ 10W The HDD, optical disk, USB devices and any other basic components could add another 10W or so. That's around 100 to 110W when in use, but you also have to take into consideration the PSU efficiency rating; if it's an 85% Energy Efficient PSU, you will have to add on up to 15% for loss. So 174W would be about 200W at the wall. 100W + your suggested 87W would be 215W at the wall. If you accept that an idle i7-2600K only uses 10W and you measure your systems overall power usage to be, say 80W at idle, then the other components are using 70W. Even excluding the PSU inefficiencies that's about 61W when idle. When a CPU is running flat out, then the motherboard is being highly used as is the RAM and HDD. [Edit 1 times, last edit by skgiven at May 27, 2011 2:21:19 PM] |
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