PCI Maximum Bus Catalyst

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victortsoi

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So I got a new r9 290x. I noticed something that made me curious in catalyst Graphics Card Manufacturer Powered by AMD
Graphics Chipset AMD Radeon R9 200 Series
Device ID 67B0
Vendor ID 1002
Subsystem ID E282
Subsystem Vendor ID 174B
Revision ID 00
Graphics Bus Capability PCI Express 3.0
]Maximum Bus Setting PCI Express 3.0x8
BIOS Part Number 113-C6710111-O44
BIOS Date 2014/10/23
Memory Size 8192 MB
Memory Type GDDR5
Core Clock in MHz 1030 MHz
Memory Clock in MHz 1375 MHz
Total Memory Bandwidth in GByte/s 352.0 GByte/s

is there a problem? why isnt it running in x16, if its in the x16 slot? Thanks.
 
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MarkW

MarkW

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What is the motherboard brand and model?

Quick and dirty answer though is no, 8x is fine for a video card. That is why SLI can function on 8x/8x.

However, if it is the only video card on the motherboard, and you are using the 16x slot closest to the CPU, you should be getting 16x in most cases. I am sure there are some exceptions out there though.

Do you have any other cards plugged into that motherboard? If so, brand and model numbers, and what slots are they in.
 
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victortsoi

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Sorry, was on my mobile. I have no other cards plugged in, and all slots are pci 16x according to the manual. gpuz detects: Pci-3.0 x16 @8 3.0, it never goes higher. I went into bios and changed pci from "auto" to x4, and no change. I just want to know if this is normal, or if there is something i can do to change pci-e to 16x, to get the most out of my expensive new card. Bios also reports that the other pci slots are disabled. Also, because of my cpu fan, I cant put the card into the slot closest to cpu, nor do i think it would be a good idea (would get hot maybe).

really appreciate your answer...

z87 sabertooth is ancient?!
 
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victortsoi

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I am shocked, but you were right. now maximum bus setting is at 16x on both gpuz and catalyst.

There was no indication of this on the manual, and this is so counterintuitive! now I just hope that this wont make my cpu overheat, although I guess it shouldnt be too bad.

Why is this the case, and why couldnt the bios just enable the other pci-e to run at 16x? Very weird.
 
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MarkW

MarkW

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Traditionally, the first slot (closest to the CPU) is the graphic card slot. The 3rd or 4th slot is the next 16x slot, but while the slot has a 16x length, it is only 8x electronically. This was done so that a pair of video cards, which are always 16x were to be used, that there would be the proper 16x slot for it to fit into.

The difference between 16x and 8x as far as performance goes is none. Thats why SLI works with both slots at 8x/8x. AMD even goes so far as to allow Crossfire with 8x/4x/4x.

In any case, I am glad to have helped you resolve this.

Have fun with that system. :)
 
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victortsoi

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Thanks. Just to follow up on this, I'm getting about 30% more fps in bf4 with the changed slot, so that seems to contradict some of what was said, that there is little improvement with switching slots.

Also, temperature's arent so bad, my cpu reached 62C max temperature, while the card got up to 75C playing battlefield. So I guess i shouldnt worry about the card really hurting hte cpu with heat with this set up. thanks.
 
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MarkW

MarkW

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Not sure what to say about the increase in FPS numbers. I know I have put some video cards in slot 3 for some people, and had no change from being in slot 1.

Both your temps are normal for playing a game like BF4.

So it looks like you have everything going right now. Enjoy the game :)
 
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