Comparing Performance and Power Use For Vista vs. Windows 7 WIth Clarksfield Chi 119
crazipper writes "Back when Intel launched its Core i5/i7 'Lynnfield' CPUs, Tom's Hardware ran some tests in Windows 7 versus Vista to gauge the benefits of the core parking and ideal core optimizations, said to cut power consumption in the new OS. It turned out that Win7 shifted the Nehalem-based CPUs in and out of Turbo Boost mode faster, resulting in higher power draw under load, while idle power was a slight bit lower. The mobile version of the architecture was claimed (at the time) to show a greater improvement in moving to Win7. Today there's a follow-up with the flagship Clarksfield processor that shows the same aggressive P-state promotion policies giving Win7 a significant performance advantage with Core i7 Mobile. However, power consumption is higher as well."
Underclocking and P-state? (Score:1, Informative)
Foo2 gives much higher performance and somewhat higher power consumption than Foo1.
Solution: Apply a downwards scalar to Foo2 so that the performance is the same and the power consumption is lower than Foo1.
MacBook Pro (Score:3, Informative)
Isn't that what Apple introduced earlier this year on the MacBook Pros? The ability to switch off the high power GPU when it's not needed and fall back to a lower quality integrated GPU? I realize that Apple used an nVidia solution instead of an Intel, but that still seems a little disingenuous.
PS: Emphasis was mine
Re:On what desktop system do you use ECC? (Score:0, Informative)
pwnd!
Re:On what desktop system do you use ECC? (Score:5, Informative)
I haven't seen a desktop in a long time that had ECC RAM, or even support for it.
Any moderately recent AMD CPU will support ECC, and it's not hard to find a mainboard that does as well (for example I believe any ASUS mainboard for AMD will support ECC, I know the one I checked a couple days ago does (cheapest ASUS AM3 mainboard on Newegg then, probably still is, only like $5 more than the cheapest other AM3 board)).
In the Core 2 era of chips desktop use normal unbuffered DDR2 or DDR3 DIMMs.
Buffered/unbuffered is separate from ECC/non-ECC. For example I know the AMD desktop chips support unbuffered ECC memory.
Desktop stuff is not ECC because it is cheaper.
Maybe 10% cheaper. And of course it's easy to make things cheaper if they don't have to work correctly.
Re:Good grief (Score:3, Informative)
Lynnfield = the internal name for the new Core i5/Core i7 CPUs for LGA 1156.
Core parking/ideal core = two optimizations from Microsoft in Win7 that are supposed to save power by consolidating background tasks onto as few CPU cores as possible, and then putting the idle cores to sleep.
Clarksfield = Core i7 Mobile; basically, the Lynnfield stuff with a different interface, more aggressive Turbo Boost, etc.
Nehalem = Another Intel internal name referring to the whole family of 45nm CPUs based on this architecture. Members include Bloomfield, Lynnfield, Clarksfield.
Comment removed (Score:5, Informative)
Re:MacBook Pro (Score:4, Informative)
The Apple GPU switching implementation appears to require the user to restart his or her session (that is, log off and log on again.) Intel's implementation seems to support switching GPUs without logging off or restarting. The Intel solution also has to handle two different display drivers.
Some older laptops supported switching between integrated and discrete graphics as well, but I think they required a reboot to switch.
How about using XP sp3 for comparison??? (Score:5, Informative)
I cant be the only one who might think xp sp3 might actually win
Re:How about using XP sp3 for comparison??? (Score:4, Informative)
Windows 98 might win.
Re:On what desktop system do you use ECC? (Score:5, Informative)
"Intel segments the market intentionally!"
Don't forget virtualization. With AMD, you don't have to pay a premium if you plan to run virtual machines.
Re:Windows Update (Score:0, Informative)
the real nuisance of Windows Updates is the tremendous amount of CPU they use. how is it that I can update a Linux distro on inferior hardware and not notice the slowdown so much? is it because the linux system runs a user-mode program to take care of things, while windows update probably handles this in kernel mode? seriously why does Windows need so much more processing power to perform the same type of task, and less of it since Windows Update considers only the core OS and not every installed package like a Linux package manager would do?
Windows Update uses barely any CPU at all and can happily run in the background. This has nothing to do with kernel/user mode. If you are experiencing slowdowns, it more likely related to disk I/O or registry operations.
Re:How about using XP sp3 for comparison??? (Score:3, Informative)
Of course it would win. Which is why they won't allow it in the tests.