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  #1  
Old March 13, 2006, 02:24 PM
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Default PCI-X, PCI-E x1, x2, x4, x16, x32

I have been browsing the net trying to figure out details about PCI-X, PCI-E x1, x2, x4, x16, x32. The more site I visit the more confused I get. Which one(s) of these are 64 bit and which are 32 bit?? I have visited several websites including Wikipedia but they were of no help.

Could anyone summerise the differences? Please?
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  #2  
Old March 13, 2006, 03:36 PM
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Here's my limited knowledge on the stuff -


PCI-E and PCI-X are fundamentally different busses, even though their name suggests differently. Often times, that is the first source of confusion. So, start thinking of them as separate busses (no relation to each other).

There is no 32-bit or 64-bit per say in PCI-Express. Each lane has a differential pair Rx and a differential pair Tx.

So, PCI-E x1 would be a single-lane (one diff Rx channel and one diff Tx channel) bus. Similarly x2, x4, x16 .... etc are more of the same, just in parallel.

PCI-E is source-synchronous, embedded clock, packet-based.

PCI-X, on the other hand, is a glorified traditional PCI (i.e. not packet based SerDes).

By the way, for detailed and official spec of PCI-E go to http://www.pcisig.com/specifications/pciexpress

Even if it doesn't clear it up greatly for you, hope it at least gets u some pointers for further search.


Edited on, March 13, 2006, 8:41 PM GMT, by Sauron.
Reason: Added the PCI link
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  #3  
Old March 13, 2006, 03:49 PM
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Answer is none.

PCIe is uses serial communication. So bit width is not relevent here. PCIe 16x just means it has 16 channels as opposed to PCIe 1x, meaning 1x is slower than 16x common sense login .

Original pci was parallel communication, and it was 32bit wide. There are later editions as PCI-X 64bit and PCI-X 2.0.

To have full understanding read:
http://www.hardwaresecrets.com/article/190
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  #4  
Old March 13, 2006, 11:31 PM
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Thanks Nasif and Souron. I took me a while but I think I am grasping these now.

Problem is, most Dhaka Hardware vendors did not even hear of PCI-X, and they have just heard of PCI-E. I am in the process of building a Video Editing Setup and having a lot of trouble locating the proper motherboard.
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  #5  
Old March 13, 2006, 11:33 PM
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Many server class motherboards have PCI-X slot.
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  #6  
Old March 13, 2006, 11:44 PM
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Quote:
Originally posted by Spitfire_x86
Many server class motherboards have PCI-X slot.
I know Dual Xeon M/B's have these ... however, I am planning my system on Pentium D or Athlon XP.

So far for Pentium D I found only one M/B with the required slot .. Supermicro PSDGE.

For Athlon XP, I am began searching ... any suggestions?
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  #7  
Old March 14, 2006, 08:57 AM
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I don't think any motherboard manufacturer ever made AXP mobo with PCI-X slot. I guess server class motherboards for Athlon MP are discontinued.

Athlon XP is not the best CPU for video editing. Dual core Opteron, Athlon 64 X2s will perform are much better. Even single core Athlon 64s are better than AXP for video editing. But you may not get any Socket 939/Socket 754 motherboard with PCI-X slot. So you have to get Opteron and compatible socket 940 motherboard if you want to get AMD.

Pentium D is probably the best cost effective solution, especially if you get the 805 model (2.66 Ghz, 533 MHz FSB, 2 MB L2 cache). How much Pentium Ds cost now?

Edited on, March 14, 2006, 1:58 PM GMT, by Spitfire_x86.
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  #8  
Old March 14, 2006, 02:13 PM
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Quote:
Originally posted by Spitfire_x86
Pentium D is probably the best cost effective solution, especially if you get the 805 model (2.66 Ghz, 533 MHz FSB, 2 MB L2 cache). How much Pentium Ds cost now?
Edited on, March 14, 2006, 1:58 PM GMT, by Spitfire_x86.
I am going for Pentium D 940 3.2 Ghz. with Intel 955 chipset based Motherboard that has 2 PCI-X slots. Pentium D is just in the Dhaka Market and 2.8 GHz + Intel 945GNT Motherboard is being sold at Taka 30,000-31,000 as bundle. Pentium D 3.2 Ghz. is not yet available in BD.

I am importing my Entire System from Singapore because most components like 1 GB DDR2 667 Mhz. RAM modules, 500 GB Hard Drives good server class chasis with redundant power supply etc. are not yet available in Dhaka.
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  #9  
Old March 14, 2006, 02:20 PM
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Opteron has not yet been introduced in Dhaka and they are too expensive for me even in Singapore prices. Maybe my next setup in 3/4 months time will be dual opteron based.

Edited on, March 14, 2006, 7:24 PM GMT, by zakirc.
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  #10  
Old March 14, 2006, 03:54 PM
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Opteron 1xx series CPUs are not that expensive. 2 GHz dual core Opteron 1xx can easily keep up with Pentium D 3.2 Ghz. Plus plain DDR400 is good enough for Opteron, which should cost less than DDR2 667. Opteron will also run cooler and use less power.

If you need another system few months later, then keep an eye on Conroe
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  #11  
Old March 14, 2006, 11:13 PM
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I sure will ... thanks Spitfire.
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