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Enable PCI-E 2.0

post #1 of 3
Thread Starter 
Hi all, just a quick question:
I have an ASUS P5N-D, it supports pci-e 2.0. I also have a n 8800GT. However one of the programs I use (nvidia ctrl panel, i think) says the bus speed is 2500MHz. is that pci-e 2.0 speeds? the bios says the pci-e clock is 100MHz.. Is pci-e 2.0 enabled? is it an automatic setting or is it a manual setting to enable 2.0. Just wanna take advantage of the 2.0 & I dunno if I am or not. Thx in advance!
Black Mamba
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CPUMotherboardGraphicsRAM
E8400 @4 GHz 1.32 V P5N-D 750i 2x 8800GT SLi 700/1750/1800 (XFX & Zotac) OCZ 2x1GB Plat. Rev.2 425MHz @ 4-4-4-15 2T 
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Seagate 500GB-32MB-7200.11 Windows 7 Ultimate 32-bit Samsung 931BF Zboard 
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Black Mamba
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @4 GHz 1.32 V P5N-D 750i 2x 8800GT SLi 700/1750/1800 (XFX & Zotac) OCZ 2x1GB Plat. Rev.2 425MHz @ 4-4-4-15 2T 
Hard DriveOSMonitorKeyboard
Seagate 500GB-32MB-7200.11 Windows 7 Ultimate 32-bit Samsung 931BF Zboard 
PowerCaseMouseMouse Pad
BFG 550GS Antec Nine Hundred G7 3M Precise 
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post #2 of 3
The slot is always running at its full speed unless otherwise set.

The 8800gt wont see any difference to performance if your running in pci-e 2.0 or not. It simply doesnt need all that bandwidth. iirc you wont even see a performance drop until you drop it below 2x pci-e 2.0 or 4x pci-e 1.1.

But yea there is no need to 'enable' it, the board and card will automatically run at maximum capability.
Keres
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Keres
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post #3 of 3
PCI Express is the new serial bus addition to the PCI series of specifications. How ever the electrical and mechanical interface for PCI Express is not compatible with the PCI bus interface. This is a serial bus which uses two low-voltage differential LVDS pairs, at 2.5Gb/s in each direction [one transmit, and one receive pair]. A PCI Express link is comprised of these two unidirectional differential pairs each operating at 2.5Gbps to achieve a basic over all throughput of 5Gbps [before accounting for over-head]. PCI Express uses 8B/10B encoding [each 8 bit byte is translated into a 10 bit character in order to equalize the numbers of 1's and 0's sent, and the encoded signal contains an embedded clock]. PCI Express supports 1x [2.5Gbps], 2x, 4x, 8x, 12x, 16x, and 32x bus widths [transmit / receive pairs]; 2.5Gigabits/second per Lane per Direction. The 8B/10B changes the data transfer numbers to 250MBps per lane, raw data [B= Bytes, b=Bits]. The reduction in throughput is accounted for under the protocol section.

http://www.interfacebus.com/Design_C...I_Express.html

Bus Spec Transfer Rate Throughput Rate
PCI; 33MHz, 32-bit 133MBps -
PCI-Express x1 250MBps -
AGP 2x 533MBps -
PCI-Express x4 1,000MBps -
AGP 4x 1,066MBps -
AGP 8x 2,133MBps -
PCI-Express x16 4,000MBps
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