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Interpreting Gigabyte LGA775 mobo specs
I'm looking for a Gigabyte LGA775 board that has among other things a PCIe 2.0 or higher slot for the video card.
I've been looking at specs on their boards and notice there are some that in the overview specify PCIe 2.0 but some for example this GA-EP43T-UD3L http://www.gigabyte.com/products/pro...id=3597&dl=#ov that say "Ultimate graphics performance with PCI-E x16 interface" but doesn't specify PCIe 2.0 but in the specifications area it says: 1.1 x PCI Express x16 slot, running at x16 (The PCI Express x16 slot conforms to PCI Express 2.0 standard.) Is this the same as saying it has a PCIe 2.0 slot? This particular board supports DDR3 Ram, is there such a thing as a board with DDR3 that doesn't have a PCIe 2.0 slot? There are various like this where 2.0 isn't explicitly stated in the overview. Wondering if it's just an editorial oversight. Thanks |
#3
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Interpreting Gigabyte LGA775 mobo specs
On Wednesday, August 21, 2013 6:39:21 PM UTC-4, Paul wrote:
Note that, in practice, you cannot get 8GB/sec. The chipset uses "tiny buffers" for PCI Express packets. On Intel, this typically cuts the practical bandwidth in half. More details here. Half of 8GB/sec roughly, gives you 4GB/sec practical transfer rate, and anything over 1GB/sec is good enough (doesn't harm video performance too much). (Tomshardware did tests years ago, and back then, anything over 1GB/sec was plenty.) What I want to ensure is tat the slot won't rob any performance from a video card for gaming purposes. I.e. - if I get a faster card than what I have - a GTX 460 Cyclone 1gb that I'll see all the performance the card is capable of with some room left over for OC'ing. From what I've been reading a lot of the hoopla about the PCIe generations is marketing hype, that many 2.0 labeled cards don't actually perform any better in a 2.0 slot than they do in a 1.0 slot. I've read that the GTX 460 is such a card. It's labeled 2.0 but supposedly it doesn't even saturate a 1.0 slot. I wonder how one finds out whether a given card actually would be impeded by a 1.0 slot. I assume the same is true going from 2.0 to 3.0. |
#4
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Interpreting Gigabyte LGA775 mobo specs
wrote:
On Wednesday, August 21, 2013 6:39:21 PM UTC-4, Paul wrote: Note that, in practice, you cannot get 8GB/sec. The chipset uses "tiny buffers" for PCI Express packets. On Intel, this typically cuts the practical bandwidth in half. More details here. Half of 8GB/sec roughly, gives you 4GB/sec practical transfer rate, and anything over 1GB/sec is good enough (doesn't harm video performance too much). (Tomshardware did tests years ago, and back then, anything over 1GB/sec was plenty.) What I want to ensure is tat the slot won't rob any performance from a video card for gaming purposes. I.e. - if I get a faster card than what I have - a GTX 460 Cyclone 1gb that I'll see all the performance the card is capable of with some room left over for OC'ing. From what I've been reading a lot of the hoopla about the PCIe generations is marketing hype, that many 2.0 labeled cards don't actually perform any better in a 2.0 slot than they do in a 1.0 slot. I've read that the GTX 460 is such a card. It's labeled 2.0 but supposedly it doesn't even saturate a 1.0 slot. I wonder how one finds out whether a given card actually would be impeded by a 1.0 slot. I assume the same is true going from 2.0 to 3.0. I don't think this test measures bandwidth. Instead, they did a benchmark comparison between PCI Express 2 and 3 operating modes (500MB/sec per lane, versus 1GB/sec per lane). http://www.anandtech.com/show/5264/s...ie-30-it-works And the claim is, it doesn't help for gaming. And helps a bit for the GPGPU benchmark they were using. There are some gaming results here. For a GTX 680. http://www.hardocp.com/article/2012/...mance_review/2 http://www.techpowerup.com/reviews/I...caling/24.html There is also a PCIe-Speed-Test, but I can't be sure what it's testing. The danger with tests like this, is when they draw their results from some cache, rather than traveling across a system bus. At least one line in the test is anomalous (seems too high). http://www.xtremesystems.org/forums/...bandwidth-test These are the kind of things, you want a test instrument to verify the software test is consistent with a hardware capture. Here, a NIC card company does some testing. This is not fast enough for the purpose of testing. You really need a card dedicated to such testing. You can't get that from FPGAs, so it would take some other kind of chip (like a test mode in a PLX chip perhaps). https://www.myricom.com/software/myr...therboard.html Paul |
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