Go Back   AnandTech Forums > Hardware and Technology > Motherboards

Forums
· Hardware and Technology
· CPUs and Overclocking
· Motherboards
· Video Cards and Graphics
· Memory and Storage
· Power Supplies
· Cases & Cooling
· SFF, Notebooks, Pre-Built/Barebones PCs
· Networking
· Peripherals
· General Hardware
· Highly Technical
· Computer Help
· Home Theater PCs
· Consumer Electronics
· Digital and Video Cameras
· Mobile Devices & Gadgets
· Audio/Video & Home Theater
· Software
· Software for Windows
· All Things Apple
· *nix Software
· Operating Systems
· Programming
· PC Gaming
· Console Gaming
· Distributed Computing
· Security
· Social
· Off Topic
· Politics and News
· Discussion Club
· Love and Relationships
· The Garage
· Health and Fitness
· Merchandise and Shopping
· For Sale/Trade
· Hot Deals with Free Stuff/Contests
· Black Friday 2013
· Forum Issues
· Technical Forum Issues
· Personal Forum Issues
· Suggestion Box
· Moderator Resources
· Moderator Discussions
   

Reply
 
Thread Tools
Old 09-27-2011, 03:24 AM   #1
theraque
Junior Member
 
Join Date: Sep 2011
Posts: 3
Default PCIe 2.1 and 3.0

I'm just looking around for a mobo for a friend of mine in the market for a gaming rig. All new video cards are PCIe 2.1 compliant, but I have yet to find a mobo that actually has PCIe 2.1 onboard, they're all 2.0 and yes, I do realise that 2.1 will work on 2.0. I'm just interested to know if anyone's actually come across any mobo that specifically says it has 2.1 PCIe slots. I am aware that in the next 3 or so months we'll be getting PCIe 3.0 hit the market but that's 3 months at best since demo boards just were shown this month.
theraque is offline   Reply With Quote
Old 09-27-2011, 04:29 AM   #2
marino.DV
Member
 
marino.DV's Avatar
 
Join Date: Sep 2011
Posts: 96
Default

i also have a question regarding this topic: video cards that are running 3.0 can they be used on motherboards with 2.X let's say ?
marino.DV is offline   Reply With Quote
Old 09-27-2011, 10:22 AM   #3
IntelEnthusiast
Intel Representative
 
IntelEnthusiast's Avatar
 
Join Date: Feb 2011
Location: Utah
Posts: 582
Default

PCI-e 3.0 will be backwards compatible to the earlier standards. So you can put a PCi-e 2.0 card into a PCi-e 1.1 slot and it will still work but at the limited speed the lower standard. http://en.wikipedia.org/wiki/PCI_Express

Christian Wood
Intel Enthusiast Team
IntelEnthusiast is offline   Reply With Quote
Old 09-28-2011, 08:14 AM   #4
theraque
Junior Member
 
Join Date: Sep 2011
Posts: 3
Default

I got a 2.1 Radeon 6850 on a 2.0 board and no probs.I realise all the versions are backwards compatible, I'm looking for a motherboard that contains said newer revisions to the spec. Any ideas where's I can get a 2.1 board?
theraque is offline   Reply With Quote
Old 09-28-2011, 09:12 AM   #5
Stuka87
Platinum Member
 
Stuka87's Avatar
 
Join Date: Dec 2010
Location: California
Posts: 2,066
Default

Quote:
Originally Posted by IntelEnthusiast View Post
PCI-e 3.0 will be backwards compatible to the earlier standards. So you can put a PCi-e 2.0 card into a PCi-e 1.1 slot and it will still work but at the limited speed the lower standard. http://en.wikipedia.org/wiki/PCI_Express

Christian Wood
Intel Enthusiast Team
This is entirely incorrect. The backwards compatibility between 2.x and 1.x is entirely OPTIONAL by the card maker. The truth is that very few 2.x cards will function in a 1.x slot. It is NOT a required part of the standard. There are quite a few other changes besides "speed" that separates the two.

I would not hold my breath on all 3.x cards working in 2.x slots.
__________________
Gaming: Antec 300 Illusion | Phenom II 965BE @4114MHz | Xigmatek Gaia | MSI 790GX-G65 | 12GB Crucial DDR3 1333 | Sapphire HD7950 OC 1100/1400 | Antec NEO ECO 520C | ViewSonic VP2365wb
Work: Dell Precision M4600 | i7-2620 | 8GB | 2GB Quadro 1000 w/Optimus | Dual Dell 2412M's
Stuka87 is offline   Reply With Quote
Old 09-28-2011, 09:48 AM   #6
Epsilon-Zero
Member
 
Join Date: May 2011
Posts: 33
Default

The reason why you dont see any boards with an advertised 2.1 slot is that the difference between a 2.0 slot doesnt impact performance.

If I remember right it just added management, support, and troubleshooting systems; which actually wont be fully implemented until 3.0.

So basically dont worry about it, your 2.1 GPU will be running at full steam regardless if its on 2.0 or 2.1

@Stuka Im sure most of the 3.0 cards will work on 2.0 for the first 2 years of production, but it does remain to be seen. Hell, we may not even have cpus that can support it until next year if Intel cant get its act together.
Epsilon-Zero is offline   Reply With Quote
Old 09-28-2011, 10:42 AM   #7
IntelEnthusiast
Intel Representative
 
IntelEnthusiast's Avatar
 
Join Date: Feb 2011
Location: Utah
Posts: 582
Default

Quote:
Originally Posted by Stuka87 View Post
This is entirely incorrect. The backwards compatibility between 2.x and 1.x is entirely OPTIONAL by the card maker. The truth is that very few 2.x cards will function in a 1.x slot. It is NOT a required part of the standard. There are quite a few other changes besides "speed" that separates the two.

I would not hold my breath on all 3.x cards working in 2.x slots.

OK thanks Stuka, I havent heard of one person that has a problem with the backwards compatibility on any PCI-e connect and there are no pci-e 3.0 cards yets to see but thank you for the correction.

Christian Wood
Intel Enthusiast Team
IntelEnthusiast is offline   Reply With Quote
Old 09-28-2011, 11:47 AM   #8
Michael Meio
Member
 
Join Date: Jul 2011
Posts: 43
Default

IMO, PCI-e 3.0 will be stalled for a while.

In my experience, I've tested some PCI-e 2.0 and 2.1 GPUs on both PCI-e 1.x and 2.x, ran some tests, went back and forth and TBH, I can't say there is no difference, but I'm totally sure, no one can tell by experiencing but by numbers derived from such tests.

It all comes to bandwidth and other stuff but haven't crossed the bandwidth limit myself on a PCI-e 1.x... Maybe the way I use computers is far too ordinary and some purists surely disagree, but essentially, we could have lived without PCI-e 2.x and should survive for a long time steering clear from PCI-e 3.x.

I don't want to blame it all on economics but I guess we have to sit and wait to see who's gonna bet on this and win.
Michael Meio is offline   Reply With Quote
Old 09-28-2011, 06:58 PM   #9
VirtualLarry
Lifer
 
VirtualLarry's Avatar
 
Join Date: Aug 2001
Posts: 25,084
Default

Quote:
Originally Posted by Stuka87 View Post
This is entirely incorrect.
No, it's not. Save for a few wierd motherboards with, say, Via chipsets, the vast majority of PCI-E 2.0-compatible cards work just fine in a PCI-E 1.1 mobo.

My P35 mobo with a PCI-E 1.1 x16 slot is living proof of that.
__________________
Rig(s) not listed, because I change computers, like some people change their socks.
ATX is for poor people. And 'gamers.' - phucheneh
haswell is bulldozer... - aigomorla
"DON'T BUY INTEL, they will send secret signals down the internet, which
will considerably slow down your computer". - SOFTengCOMPelec
VirtualLarry is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:09 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.