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 Forum index » Advanced Topics » Hardware » Video
Single GPU vs Crossfire
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jp734

Joined: 29 Mar 2014
Posts: 65

PostPosted: Fri 22 May 2015, 09:41    Post subject:  Single GPU vs Crossfire  

I'm thinking about setting up my system using crossfire but wondering what the advantage is when one slot is only PCIe x8 compared to one gpu using the x16 slot. I will be using identical cards.
Last edited by jp734 on Fri 22 May 2015, 16:56; edited 1 time in total
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bark_bark_bark

Joined: 05 Jun 2012
Posts: 1918
Location: Wisconsin USA

PostPosted: Fri 22 May 2015, 11:52    Post subject:  

With Crossfire, I believe it allows you to use 2 or more cards as one. So if you use have two cards with 1GB of memory, it would be like having one card with 2GB of memory.
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jp734

Joined: 29 Mar 2014
Posts: 65

PostPosted: Fri 22 May 2015, 13:46    Post subject:  

Thanks for the reply. I understand that but my question is, if I am using two identical cards but one is placed on x16 slot and the other one is on x8, it will probably use the x8 speed. So what is the advantage of doing it compared to using one card using x16 speed?
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bigpup


Joined: 11 Oct 2009
Posts: 8936
Location: Charleston S.C. USA

PostPosted: Sat 23 May 2015, 23:54    Post subject:  

With two cards, you will always see some improvement.
X8 or X16 is not that much of an issue with older hardware.

Really new graphics cards are going to need two X16 slots.

If you are trying to crossfire some really old cards. Just for the vast improvement in hardware ability, you may be better off just getting one newer card.

Need to make sure your power supply and motherboard can support the two cards.

What you are going to run with the graphics is also a big factor.

Unless you are running some of the newest games, the one card you already have is all you probably need.

Google for comparisons of single card vs crossfire, for the graphics cards you want to use.

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jp734

Joined: 29 Mar 2014
Posts: 65

PostPosted: Sun 24 May 2015, 09:26    Post subject:  

I do drawings for work using Microsoft Visio. Company issued a laptop with i5 quad 2.4GHz with an intel and AMD graphics. Sometimes when I draw I have to really zoom in to place the line on the right spot and when I zoom in, it sometimes takes 10-15 seconds to focus before it lets you make another line. At work we also have a dell desktop with i7 4790 and an nvidia graphics card (forgot the model) and I was disappointed. I was expecting a lot more, better performance.

At home, I have a Core 2 Quad Q9500 with ATi radeon HD 5450, and for some reason, it responds a lot faster than the two, seriously. It obviously can't be the processor so I figure it's gotta be the gpu and that's what made me think about "crossfire" setup ( two HD 5450)
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