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#11
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Worth upgrading?
On 6/16/2010 3:43 AM, Nate Edel wrote:
There are often enough badly-written tasks that sit at 100% utilization that with a regular 2-core/1-thread-per-core CPU you're back to essentially having a single-threaded CPU for everything else. It seems reasonably unusual to have two of those at once, and my intuition is that a dual-core/2-threads-per-core (ie i3/i5 model) will do nearly as well as a real quad-core for most people. I had an Athlon X2 which was often hammered by a locked up application taking 100% on a full core. Sometimes that 100% would lock up disk resources too, so even the other core would have to wait. I replaced that with a Phenom II X3 (which I was hoping to "over-core" it to 4 cores, but alas it was not to be). The number of lockups due to those badly written programs has gone done significantly. Tasks that run 2 or more threads at 100% for real work will want more than 2 physical cores; my main experience with that is video encoding. I assume games might require real cores too, rather than virtual cores. I keep hearing conflicting information about how many simultaneous cores games can fully utilize. Some say you don't need any more than 2 cores, others have said 3 is the absolute maximum, if the games are multi-threaded, then they should be able to use all cores present as they need it. I'm not sure whether the extra thread per core makes much difference on quad core systems, with one exception: virtualbox runs a LOT better on my work system (Xeon W3565, 4 cores/8 threads, 3.2ghz, 12gb) than my home system (Q9550 overclocked at 3.15ghz, 8gb) but more memory, more cache and the newer core (including better VT?) makes it hard to compare directly even with the clock speeds relatively close. Virtualization kills my machine. I got Windows XP virtualized under Windows 7 now, and it's horrid, I won't even begin trying to virtualize Ubuntu under it yet. It feels like I have a single-core machine again. Here I think if I had more than 3 physical cores I would've been safe. Yousuf Khan |
#12
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Worth upgrading?
On Jun 16, 2:44*am, Yousuf Khan wrote:
Virtualization kills my machine. I got Windows XP virtualized under Windows 7 now, and it's horrid, I won't even begin trying to virtualize Ubuntu under it yet. It feels like I have a single-core machine again. Here I think if I had more than 3 physical cores I would've been safe. Just for jollies, I fired up an instance of Fedora under vmware on this box (core i7-920 with Vista as the host OS). Right now, I have graphical connections to six machines, plus the virtual machine. In order to maintain my sanity, I have four virtual Windows desktops. The virtual machine was slow to boot, but now that it is running, it isn't noticeably slower. Even sometimes-slow-like-a- tired-old-dog Firefox runs fine on the virtual machine. I won't speculate on what other processors or os combinations might or might not be able to do or why. It's nice to have a machine that just works without my having to float random guesses as to what would work. Robert. |
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