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Brief explaination of PCI-e 2.0 vs. 2.1?

post #1 of 9
Thread Starter 
Well, ... I suppose what I am really asking is what would happen if I installed a 2.1 with a board that states it supports 2.0?

The board is an ASUS M4A87TD EVO.

I am looking to upgrade from a PCI-E 2.0 Radeon HD 4670 (1GB, 128-bit, GDDR3) to a 2.1 5xxx with 1GB & GDDR5. Or am I stuck with having to go the 2.0 5xxx route?

(I dunno, just adding this ----> NOT a gaming machine.)
    
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post #2 of 9
It's certainly compatible, but whether or not it would bottleneck the performance to any noticeable extent, I don't know. But, it'll probably be no different in performance as compared to just sticking it into a 2.1 board. I mean, we can't even really tell a difference between using a 1.0 board and a 2.0 board yet. Well, maybe in benchmarks, but not in real-world performance (however, I am actually only going by what a few different people here on OCN have told me).
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post #3 of 9
Quote:
Originally Posted by Wikipedia
PCI Express 2.1 supports a large proportion of the management, support, and troubleshooting systems planned to be fully implemented in PCI Express 3.0. However, the speed is the same as PCI Express 2.0. Most motherboards sold currently come with PCI Express 2.0 connectors.
I don't think there is any performance difference what so ever.
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post #4 of 9
Thread Starter 
So what would you guys do? 2 or 2.1? That is, in my situation - everything is in my SigRig ... just not a PC Gamer ....
    
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post #5 of 9
It will work just fine. PCiE2.1 merely ports diagnostic features of PCiE3 down to 2.0 the result being called "2.1" There is no difference in speed.
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post #6 of 9
yeah it will work. You'll be fine. Wont notice a thing.
post #7 of 9
Quote:
Originally Posted by Zeke311 View Post
So what would you guys do? 2 or 2.1? That is, in my situation - everything is in my SigRig ... just not a PC Gamer ....
To expand on above, I had an EVGA 680i SLI which is a 1.0 board. On this board, I followed this upgrade path: 8600 GTS > 9800 GTX + > GTX 260. Both the 9800 GTX + and the GTX 260 were 2.0 cards, so I became concerned that they were being bottlenecked by the the PCI-E 1.0 ports. So, I made a thread here on OCN about it and ended up learning that if there WAS a bottleneck at all, then I'd only be able to see the differences on paper.

The same is true with 2.1 vs. 2.0. Except in this case (according to what's been said above), there is no performance difference whatsoever. But with 2.0 vs. 1.0, there is supposed to be a difference. Or at least there was. I mean, I have yet to learn of a 2.0 card that actually takes full advantage of the 2.0 technology whereby it would be noticeably bottlenecked by a PCI-E 1.0 slot.
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #8 of 9
2.0 and 2.1 are practically identical as mentioned above.

Any PCIe card will work in that board
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post #9 of 9
I just ordered a new m4a89gtd usb3 for about $35 cheaper than anywhere else I've seen, but although I have a PCIe 2.1 5670 1GB card(til I get get a 6950), I don't know any AMD MB that is advertized as PCIe 2.1
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