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Thread:  Join "MyOnlineTeam" Today - Chapter 35 |
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Thread Status: Active Total posts in this thread: 628
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Dataman
Ace Cruncher Joined: Nov 16, 2004 Post Count: 4865 Status: Offline Project Badges: 
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Another silly question.. what is the REAL difference between 32 bit and 64 bit systems? Dr. Mike 64-bit *** There's a new science release at AQUA that is supposed to reduce the runtime. My first one blew up last night but I was expecting that. I grabbed one of the new ones. BTW: Their credits SUCK!! There are already complaints in their board and people jumping back to GPUGrid. I expect there will be some adjustments.    |
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darth_vader
Veteran Cruncher A galaxy far, far away... Joined: Jul 13, 2005 Post Count: 514 Status: Offline Project Badges: 
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Another silly question.. what is the REAL difference between 32 bit and 64 bit systems? Dr. Mike Simply put, the main observable difference between 32-bit and 64-bit systems is the amount of memory they can address. 32 bits allows a system to use up to 4GB of memory. 64 bits allows a system to use up to 2**64 or 16 exabytes of memory... or 4 billion times as much as 32 bits. Windows 32-bit operating systems only allow the user to have about 3GB and not the full 4GB because the rest is reserved for Windows' use. This is wasteful, unnecessary and just another example of Microsoft's shortcomings (sorry, I couldn't resist)  For most systems, 64 bits also allow arithmetic and other operations to be done on twice as much data in a single operation.... so theoretically, 64-bit systems can be almost twice as fast if they are running 64-bit applications. Reality is more complicated. Of course, there's more to it than that. We can go into (lots) more detail if you're interested, but I think you just wanted the highlights. - D |
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NiceMedTexMD
Veteran Cruncher United States Joined: Aug 17, 2006 Post Count: 929 Status: Offline Project Badges:
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Another silly question.. what is the REAL difference between 32 bit and 64 bit systems? Dr. Mike Simply put, the main observable difference between 32-bit and 64-bit systems is the amount of memory they can address. 32 bits allows a system to use up to 4GB of memory. 64 bits allows a system to use up to 2**64 or 16 exabytes of memory... or 4 billion times as much as 32 bits. Windows 32-bit operating systems only allow the user to have about 3GB and not the full 4GB because the rest is reserved for Windows' use. This is wasteful, unnecessary and just another example of Microsoft's shortcomings (sorry, I couldn't resist) For most systems, 64 bits also allow arithmetic and other operations to be done on twice as much data in a single operation.... so theoretically, 64-bit systems can be almost twice as fast if they are running 64-bit applications. Reality is more complicated. Of course, there's more to it than that. We can go into (lots) more detail if you're interested, but I think you just wanted the highlights. - D Just the highlights is fine.. lol Dr. Mike  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Another silly question.. what is the REAL difference between 32 bit and 64 bit systems? Dr. Mike Simply put, the main observable difference between 32-bit and 64-bit systems is the amount of memory they can address. 32 bits allows a system to use up to 4GB of memory. 64 bits allows a system to use up to 2**64 or 16 exabytes of memory... or 4 billion times as much as 32 bits. Windows 32-bit operating systems only allow the user to have about 3GB and not the full 4GB because the rest is reserved for Windows' use. This is wasteful, unnecessary and just another example of Microsoft's shortcomings (sorry, I couldn't resist) For most systems, 64 bits also allow arithmetic and other operations to be done on twice as much data in a single operation.... so theoretically, 64-bit systems can be almost twice as fast if they are running 64-bit applications. Reality is more complicated. Of course, there's more to it than that. We can go into (lots) more detail if you're interested, but I think you just wanted the highlights. - D That is not necessarily true. The ~4 GB includes video memory, not reserved for the operating system usage. |
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brown chris
Master Cruncher California - USA Joined: Nov 18, 2004 Post Count: 2556 Status: Offline Project Badges: 
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The first GPUGRID result came in.
----------------------------------------I had to dig through the posted wu's on my vista 32 machine, but I finally found a wu that matched. Bottom line, vista 64 did the same kind of wu 18 minutes faster than vista 32 did it. The reason I think it's true, is because the milliseconds per step were faster on v64 as opposed to v32, and the step timings were all the same for that kind of wu on v32. v64 is running the same wu right now, and it's almost done. when it posts, I will check to see if it has the same timings as the last one it posted. [Edit] The second WU finished, and it was still faster but only 9.6 mins faster instead of 18 mins. 42.8 ms per step as opposed to 44.something ms under 32-bit vista.
BIG BANG THEORY: In the beginning there was nothing... which exploded
----------------------------------------[Edit 1 times, last edit by brown chris at May 30, 2009 6:57:06 PM] |
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brown chris
Master Cruncher California - USA Joined: Nov 18, 2004 Post Count: 2556 Status: Offline Project Badges:
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Another silly question.. what is the REAL difference between 32 bit and 64 bit systems? Dr. Mike Windows 32-bit operating systems only allow the user to have about 3GB and not the full 4GB because the rest is reserved for Windows' use. This is wasteful, unnecessary and just another example of Microsoft's shortcomings (sorry, I couldn't resist) - D Actually, it has nothing to do with Microsoft or Windows. It's a limitation of the 32-bit, x86 architecture. There are ways to trick 32-bit OS's using Physical Address Extentions (PAE), but you will have to give up video memory. Bottom line is, 32-bit operating systems can only "see" 4GB of addressing space. The OS gets some, the bios gets the rest. Remember the old days of DOS when all we had was 16-bit operating systems? All it could "see" was 1 MB, and could only use 640K. Extended memory mapping technologies enabled us to see more, but it did it by tricking the operating system by swapping memory address spaces into and out of an area that DOS could see. That could still work now, but it wasn't very efficient. With the much faster computers we have these days, it would be a huge performance hit.
BIG BANG THEORY: In the beginning there was nothing... which exploded
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brown chris
Master Cruncher California - USA Joined: Nov 18, 2004 Post Count: 2556 Status: Offline Project Badges:
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Another silly question.. what is the REAL difference between 32 bit and 64 bit systems? Dr. Mike 64-bit *** There's a new science release at AQUA that is supposed to reduce the runtime. My first one blew up last night but I was expecting that. I grabbed one of the new ones. BTW: Their credits SUCK!! There are already complaints in their board and people jumping back to GPUGrid. I expect there will be some adjustments. That was one reason I dropped SETI. Besides the fact that three quarters of the planet is crunching for SETI and they don't need my help, a wu would take 50+ hours to complete and they would award around 2-3K credits for it. GPUGrid gives 5K credits for a wu that takes my card about 7 hours to process... I know it's not about the credits (it makes it fun, though), but I figure when the little green people want to be found they will make it obvious.
BIG BANG THEORY: In the beginning there was nothing... which exploded
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brown chris
Master Cruncher California - USA Joined: Nov 18, 2004 Post Count: 2556 Status: Offline Project Badges:
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Has anyone ever tried this? I know that SLI needs matching video cards, but what would happen if I put a different video card in along side my 275. Say, a 9800. If I don't strap them with the SLI connector, would GPUGRID still use both cards? My computer has two power supplies in it, so I'm not worried about a lack of power... Just curious - I would try it, but I don't want to bung up my pristine copy of Vista just yet... I beleive so Chris. If you disable SLI BOINC should reconize each card and run two wu's. Geez - I have a huge itch to try it now!
BIG BANG THEORY: In the beginning there was nothing... which exploded
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Dataman
Ace Cruncher Joined: Nov 16, 2004 Post Count: 4865 Status: Offline Project Badges:
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Has anyone ever tried this? I know that SLI needs matching video cards, but what would happen if I put a different video card in along side my 275. Say, a 9800. If I don't strap them with the SLI connector, would GPUGRID still use both cards? My computer has two power supplies in it, so I'm not worried about a lack of power... Just curious - I would try it, but I don't want to bung up my pristine copy of Vista just yet... I beleive so Chris. If you disable SLI BOINC should reconize each card and run two wu's. Geez - I have a huge itch to try it now! Scratch it! None of my aged MoBo's have two slots.  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Has anyone ever tried this? I know that SLI needs matching video cards, but what would happen if I put a different video card in along side my 275. Say, a 9800. If I don't strap them with the SLI connector, would GPUGRID still use both cards? My computer has two power supplies in it, so I'm not worried about a lack of power... Just curious - I would try it, but I don't want to bung up my pristine copy of Vista just yet... I beleive so Chris. If you disable SLI BOINC should reconize each card and run two wu's. Geez - I have a huge itch to try it now! Scratch it! None of my aged MoBo's have two slots. BOINC will read both video cards. I've ran into the issue that sometimes when I boot up it will detect one.. so I have to reboot a second time. Be wary about using two PSUs. The lifespan of the minor one is dramatically decreased. |
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