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Old July 31, 2010, 03:55 PM
Zero82z Zero82z is offline
Join Date: Sep 2009
Location: Montreal, QC
Posts: 5,415

My System Specs


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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