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CrossfireX 7970 GHZ problem.

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hullabalusa

Registered
Joined
May 22, 2014
System:

Asus Maximus IV Extreme P67 B3
i5 3570k @ 4.0GHz
16GB Corsair Vengence 1600MHz
Sapphire 7970 Ghz Ed.
Sapphire 7970 Ghz Ed.
Intel 330 SSD 60GB (W8.1)
2x - WD 2TB HDD

------------------------------------------

My problem is the bandwidth the cards are running at.
One is x8 3.0 ... and the other is x4 3.0.
ULPS is disabled.

The motherboard slots go as follows:

x16/8 _ 1
----------------------------- <===== 1 GPU here

x16 _ 2
-----------------------------

x4_1
---------------

x8_1
----------------------------- <===== 1 GPU here

x1_1
-------

x16 _ 3
-----------------------------



That is set up how the manual says, also i have tried the other slots to no prevail.


Also tried reinstalling older drivers and beta drivers too.


So if anyone could help figure out why its running x8 - x4, you would be a god.



Pictures:

Trixx -

1st GPU
3llga2


2nd GPU
3llgh9



GPU-Z:

1st GPU
3llgn7


2nd GPU
3llgqh




I know is says its x8 1.1 and x4 1.1 but when the gpu's are in use they go to x8 3.0 and x4 3.0


Thanks :)
 

ATMINSIDE

Sim Racing Aficionado Co-Owner
Joined
Jun 28, 2012
I just looked up your motherboard and it shows support for PCIe 2.0 X8 per lane when running dual GPUs.

PCIe 2.0 X16 = PCIe 3.0 X8
PCIe 2.0 X8 = PCIe 3.0 X4
 

Pierre3400

annnnnnd it's gone
Joined
May 15, 2010
Location
Euroland, Denmark
First of all, Welcome to OCF.com

Second of all.

When using GPU-z to check you GPU's, when they are doing nothing, they will alway revert to PCI-e 1.1, click the button next to it, and you will get a render test, start that, but dont go full screen, and you will see it go to 3.0, like you see when its doing something.

You pictures do not work for me? Soon you will be able to upload via this site. Use it when yuo can. (10+ posts i think?)

Moving right along.

[NEVER MIND- ATMINSIDE hit it spot on i think]

If you run 3dMark11, what sort of scores are you getting with 2x 7970Ghz?
 
OP
H

hullabalusa

Registered
Joined
May 22, 2014
Is there much difference between PCIe 2.0 X8 and PCIe 3.0 X4? if so which is better and how could i change
 

Pierre3400

annnnnnd it's gone
Joined
May 15, 2010
Location
Euroland, Denmark
Dont really know if that score is in the ball park.

I score 17000p (performance score) with 2x 7970ghz, same clocks are you.

That score with my 4770K @ 4.5ghz and the XMP loaded on the ram.

There seems to be in my eyes something wrong, wether it is the difference between the chipset and the i5 with lower clock, i dont know. But i do feel the score is too low.

I scored 14000p with 3770K and Z77 chipset.
 
OP
H

hullabalusa

Registered
Joined
May 22, 2014
All the results iv seen are people getting like P24k? also just read something about a guy getting P19k with 3.0GHz (CPU) and 2x 7970 Ghz :S
 
OP
H

hullabalusa

Registered
Joined
May 22, 2014
i have LN2 mode on my motherboard, never really touched what i didnt understand (i have a habbit of exploring and breaking things xD) ... all i know its for is something like cold booting to garuntee it POST's
 

Pierre3400

annnnnnd it's gone
Joined
May 15, 2010
Location
Euroland, Denmark
i have LN2 mode on my motherboard, never really touched what i didnt understand (i have a habbit of exploring and breaking things xD) ... all i know its for is something like cold booting to garuntee it POST's

LN2 is beyond anything you will ever use.

Just so you know what LN2 is: http://en.wikipedia.org/wiki/Liquid_nitrogen

24K on 2x7970 would require LN2.

I hit 18000p with 1200/1600 clocks on water, with 2x, so that sounds about right.

But at the end of the day, are you seeing improvements in games?
 

ATMINSIDE

Sim Racing Aficionado Co-Owner
Joined
Jun 28, 2012
LN2 is beyond anything you will ever use.

Just so you know what LN2 is: http://en.wikipedia.org/wiki/Liquid_nitrogen



I hit 18000p with 1200/1600 clocks on water, with 2x, so that sounds about right.

But at the end of the day, are you seeing improvements in games?

Which is quite a bit above stock (and your CPU will score better in physics)
So 13K is about right.

so whats the LN2 mode on my mobo? :S

It puts the BIOS into a mode for LN2 benchmarking.
You have zero need for the function.