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zaczac
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 Posted: Sat Mar 12, 2011 3:57 pm Post subject: P8P67 WS Revolution PCI Express question |
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Alright so I have 2 5970s and need a socket 1155 motherboard that can support them both in x16 mode. After looking into it I think you need the NF200 chip on the board to support it. 1st Question is does the NF200 chip lower performance at all over a normal board that have x16 x16 support?
second question is does the P8P67 WS Revolution support x16 x16 and which slots could I use. I need atleast 2 slots inbetween because of the coolers I have on them so would it be possible to use slot 1 and 5? I tried looking in the manual but I am still confused. Thanks.
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kls85
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| Posted: Sat Mar 12, 2011 5:41 pm Post subject: |
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NF200 chip isn't required if a chipset itself can provide both PCIe x16 slots to run at full x16 mode. It's needed when a motherboard have multiple PCIe x16 slots and there isn't enough go around.
The board you have does not support multiple graphic setups to run at full x16 mode. When multiple graphics are installed, the slots will run at x8.
Multiple graphic setup to run at full x16 mode are reserved for high-end chipset and current Intel chipsets used on Sandy Bridge is mainstream.
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zaczac
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| Posted: Sat Mar 12, 2011 5:44 pm Post subject: |
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"Designed for true power users, the P8P67 WS Revolution uses a built-in NF200 controller that enhances bandwidth availability between the board and the four graphics card expansion slots. This is ideal for NVIDIA GeForce SLI™ and AMD CrossFireX™, as the new motherboard can easily handle 2-Way SLI in dual PCI Express X16, while 3-Way SLI works in dual PCI Express X8 and one X16 link. This translates into a 26.4% performance increase compared to regular P67 motherboards with similar SLI"
Thats right from the product page... It seems like it will run dual cards at 16x 
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kls85
I post too much
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| Posted: Mon Mar 14, 2011 8:17 am Post subject: |
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After some further looking around, that board should let you run 2 video cards at full x16 bandwidth when the PCIe x16 (black) are not used.
Here is another 1156 board with a NF200
Motherboard slot layout
On Asus product page, it says
| Asus wrote: | | 4 x PCIe 2.0 x16 (single @x16, dual @x8, triple @x8, x16, x16 ) |
It says single at x16, so that means if you installed a GTX 580 into slot 1, you get full x16 bandwidth.
Then it says "dual at x8". We assume taking another GTX 580, installed it to slot 3 and slot 1 drops down to x8.
Now here is the confusing part, "triple at x8,x16,x16".
Taking 3 GTX580 in 3-way SLI, you need to install the cards into slots 1,3, and 5. In 2-way SLI, slot 3 runs at x8, but how come if you installed a 3rd card into slot 5, slot 3 goes up to x16? Should it be x8,x8,16?
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