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-   -   Need a little info on i7s please (http://www.hardwarecanucks.com/forum/cpus-motherboards/34740-need-little-info-i7s-please.html)

muse108dc July 31, 2010 11:11 AM

Need a little info on i7s please
I am getting a upgrade within the next week or so and was just wondering about i7s. I have been looking and haven't had time to go through reviews yet but I have seen the LGA1337 and the LGA1156 (those numbers are only close guesses I seem to have forgotten the actual numbers at this moment). Now the 900 series of i7 seem to be the former and the 800 series is the later however the 2's clockspeeds over lap and I fail to see which is actually the better of the 2 series. SOmeone want to give me a basic overview of the current range please?

Pine July 31, 2010 11:51 AM

I lol'd at the LGA-LEET bit (LGA 1337). It's actually LGA 1336 and LGA 1156, so almost. The 1336 socket is arguably more future proof while the 1156 also carries very modern processors while also being current, and I'd say quite fine for the future. The 980X is only on 1336, so if you ever want to upgrade to that (or perhaps newer processors that come out in the future for the 1336 socket), you probably want to get a 1337 i7. A good choice for that would be the i7 930. 1156 is just slightly more mainstream, with options such as the i5 (A great processor for its price, in my opinion).

Sagath July 31, 2010 11:55 AM

The sole difference is the chipset. X58 and P55. X58 is 3 channel, P55 is dual channel ram. Real world, there is no advantage difference to triple channel.

The true only advantage is (according to current roadmaps) that X58 has 6 core 12 threaded CPUS (970 and 980x chips). Other then that, P55 can do anything X58 can.

Zero82z July 31, 2010 03:55 PM

LGA1366 CPUs have a triple-channel memory controller built into the CPU and use the fast QPI bus to connect the CPU to the chipset. X58 motherboards support 6-core Intel CPUs, and all LGA1366 CPUs have Hyperthreading. The X58 chipset has 36 PCI-E 2.0 lanes which allows you to have two graphics card slots with 16 lanes each as well as four more PCI-E lanes distributed amongst the remaining slots.

LGA1156 CPUs have a dual-channel memory controller and a 16-lane PCI-E controller built into the CPU. They connect to the P55 chipset using the DMI bus, which has bandwidth equivalent to 4 PCI-E 2.0 lanes. This means that you can run one graphics card slot at 16X or two at 8X, with a remaining 4 PCI-E lanes for the other slots. There will be no 6-core CPUs for the LGA1156 platform. It is limited to dual and quad-core CPUs, with or without Hyperthreading depending on the model.

The differences that will matter to you: LGA1366 has a higher memory capacity and more channels (24GB and three channels compared to 16GB and two channels for LGA1156). Therefore, it has significantly more memory bandwidth. Will you notice this? Not really, unless you use applications that are really memory-intensive. The LGA1366 platform also has many more PCI-E lanes. This one is a little more important. If you plan on running dual video cards, you might see a small performance drop at higher resolutions and detail settings compared to an LGA1366 setup with both slots running at full bandwidth. Also, newer LGA1156 motherboards have extra USB 3.0 and SATA 3.0 controller chips, which run off the PCI-E bus and consume lanes when enabled. Different motherboards have different ways of implementing this, but in some cases you may be forced to run the main graphics slot at 8X even with a single video card, which could have a performance impact in some situations.

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