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CPU Bottlenecking GPU's

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August 14, 2013 9:26:17 PM

I have 2 Sapphire Vapor X - 7770's Ghz Edition in Crossfire.

I have been doing test lately, trying to determine why I am getting terrible performance, and low gpu usage. My CPU ( FX - 4100 ) is at 100% usage during gaming, and I get low fps/low gpu usage due to this bottlenecking. I just want to confirm that this is my problem for having Crossfire Issues. What CPU will not bottleneck these cards? I was thinking of getting a FX - 6350.

More about : cpu bottlenecking gpu

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a b à CPUs
August 14, 2013 9:36:07 PM

http://www.hwinfo.com/download.php

use the sensor only option and double click on cpu usage so you can see if it is maxed out all the time.
http://prntscr.com/1lc7zm

this is an example of what you will see, best of luck I have to run,bbl
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a c 75 à CPUs
August 14, 2013 9:38:17 PM

Yes your CPU is the bottleneck, and the FX-6350 would fix that problem.
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August 15, 2013 1:00:17 AM

I monitored my CPU usage in task manager during gaming and it was at 100%, so I guess that is a bottleneck
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a b à CPUs
August 15, 2013 9:27:51 AM

good old hwinfo64 never lets me down.. out of curiosity how close are you to 100% gpu utilization.
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August 15, 2013 11:51:44 AM

fkr said:
good old hwinfo64 never lets me down.. out of curiosity how close are you to 100% gpu utilization.


Not close at all. low gpu usage for both cards.
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August 15, 2013 2:41:50 PM

So I overclocked my CPU about 10%, and in MW3 the cpu usage is about 50%, and not 100%. The odd thing is that my GPU2 Usage is at 99% load during games, and my GPU1 is about 30% usage, and I get worse performance than one card still. Any ideas as what is causing this?
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a b à CPUs
August 15, 2013 3:17:44 PM

are you using the new beta drivers
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August 15, 2013 3:19:35 PM

fkr said:
are you using the new beta drivers


Yes. I am using the new beta drivers.
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a b à CPUs
August 15, 2013 3:25:48 PM

do you have riva tuner statistics server and msi afterburner on your computer. so you can see fps and as well as cpu usage and gpu usage in realtime.

the severe lowering of CPU usage is weird.

what speed RAM are you using

also have you tried another game, in particularly a gpu intensive one
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August 15, 2013 3:29:08 PM

I have msi afterburner, and can see my gpu usage/cpu usage on my second monitor. 1600mhz Ram 8gb. I have tried other games, and same thing.
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a b à CPUs
August 15, 2013 3:35:11 PM

can you run heaven benchmark and replicate the problem

http://unigine.com/products/heaven/download/

your cpu should not bottleneck with that and it should max out your setup

also when you were overclocking did you by chance have to reset your bios and now neeed to change your pcie lanes to be shared as 8x 8x
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August 15, 2013 3:36:21 PM

fkr said:
can you run heaven benchmark and replicate the problem

http://unigine.com/products/heaven/download/

your cpu should not bottleneck with that and it should max out your setup


Will run it now. What settings should I run it in?
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a b à CPUs
August 15, 2013 3:41:48 PM

is modern warfare a dx9 game. if so the new drivers are not working well with dx9 and you would need to turn of the framepacing feature in CCC. that may help
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a b à CPUs
August 15, 2013 3:42:31 PM

i would max it out in windowed mode and see what happens. you can play with settings in real time that way
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August 15, 2013 3:45:27 PM

fkr said:
i would max it out in windowed mode and see what happens. you can play with settings in real time that way


I tried turning of framepacing and that did not help. And CrossFire does not work in Windowed mode, so can't run the benchmark in windowed.
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August 15, 2013 3:56:16 PM

fkr said:
i would max it out in windowed mode and see what happens. you can play with settings in real time that way


These are the results ^^^
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a b à CPUs
August 15, 2013 4:24:59 PM

are you running max settings in mw3.

also do you have the new metro game. try running there benchmark if you do.

need to see if it is just that game or not
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August 15, 2013 4:25:52 PM

Update : Tryed to play CS:GO and got 20 fps ! I usually get about 150fps without crossfire. One card is at 99% usage while the other is at about 30.
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August 15, 2013 4:26:39 PM

fkr said:
are you running max settings in mw3.


I had max settings, and played with them, and it was still bad.

Don't have metro : last light, and just posted that CS:GO is doing the same thing. Not the games that are causing it.
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a b à CPUs
August 15, 2013 5:21:58 PM

this is weird, I feel like i am missing something. everything was working before the overclock right. you may want to go back into your bios settings and go back to default settings and alkso look for something else that may have changed.
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August 15, 2013 5:26:35 PM

No. Everything was not working before the overclock. All BIOS settings are fine.
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August 15, 2013 6:07:07 PM

I just did a GPU-Z Render test, and it said my second GPU was PCI e x16 @ x1 2.0, while the other is PCI e x16 @ x8 2.0 Why is my second one read as x1, they should both be x8/x8.
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a b à CPUs
August 15, 2013 6:12:34 PM

the only way I know how to change that is in a settings in the bios. that is how it works on my rig. what is your motherboard. I will try and find your manual and find that setting if it is there.
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August 15, 2013 6:46:18 PM

fkr said:
the only way I know how to change that is in a settings in the bios. that is how it works on my rig. what is your motherboard. I will try and find your manual and find that setting if it is there.


My mobo is a AsRock 970 Extreme4. I didn't see any setting in the bios for the pci e slots.
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a b à CPUs
August 15, 2013 8:38:30 PM

ftp://66.226.78.21/manual/970%20Extreme4.pdf

page 20 and 48

PCIE1 / PCIE3 (PCIE x1 slot; White) is used for PCI Express cards with
x1 lane width cards, such as Gigabit LAN card and SATA2 card.
PCIE2 / PCIE4 (PCIE x16 slot; Blue) is used for PCI Express x16 lane
width graphics cards, or used to install PCI Express graphics cards to
support SLITM and CrossFireXTM function.
PCIE5 (PCIE x16 slot; Blue) is used for PCI Express x4 lane width
cards, or used to install PCI Express graphics cards to support 3-Way
CrossFireXTM function.
1. In single VGA card mode, it is recommended to install a PCI Express
x16 graphics card on PCIE2 slot.
2. In CrossFireXTM or SLITM mode, please install PCI Express x16
graphics cards on PCIE2 and PCIE4 slots. Therefore, both these
two slots will work at x8 bandwidth.”

Primary Graphics Adapter
This item will switch the PCI Bus scanning order while searching for video
card. It allows you to select the type of Primary VGA in case of multiple
video controllers. The default value of this feature is [PCI Express]. Conf
guration options: [PCI] and [PCI Express].

basically they need to in the blue slots.

i will keep looking for board specific issues

most recent bios is 2.4 updated 10 days ago
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August 15, 2013 8:59:09 PM

fkr said:
ftp://66.226.78.21/manual/970%20Extreme4.pdf

page 20 and 48

PCIE1 / PCIE3 (PCIE x1 slot; White) is used for PCI Express cards with
x1 lane width cards, such as Gigabit LAN card and SATA2 card.
PCIE2 / PCIE4 (PCIE x16 slot; Blue) is used for PCI Express x16 lane
width graphics cards, or used to install PCI Express graphics cards to
support SLITM and CrossFireXTM function.
PCIE5 (PCIE x16 slot; Blue) is used for PCI Express x4 lane width
cards, or used to install PCI Express graphics cards to support 3-Way
CrossFireXTM function.
1. In single VGA card mode, it is recommended to install a PCI Express
x16 graphics card on PCIE2 slot.
2. In CrossFireXTM or SLITM mode, please install PCI Express x16
graphics cards on PCIE2 and PCIE4 slots. Therefore, both these
two slots will work at x8 bandwidth.”

Primary Graphics Adapter
This item will switch the PCI Bus scanning order while searching for video
card. It allows you to select the type of Primary VGA in case of multiple
video controllers. The default value of this feature is [PCI Express]. Conf
guration options: [PCI] and [PCI Express].

basically they need to in the blue slots.

i will keep looking for board specific issues

most recent bios is 2.4 updated 10 days ago


Thanks. I have them installed in those blue slots.
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a b à CPUs
August 15, 2013 9:27:29 PM

amd's website says you need a 8 gigs of ram.

at least a 600 watts power supply also, if you are overclocking you may need more. but really i doubt that, it is just what amd's recommendation is.

maybe try a different 6 pin connector if you have one.

you can reseat the card if you have not already tried.

also try a clean install of GPU drivers,

use one of those driver sweepers to get rid of the amd drivers and also uninstall msi AB so there are no leftover profiles.

are your cards at stock?

i will see if I cannot reach out to another expert and get them to chime in also. a fresh mind always helps
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August 15, 2013 9:30:33 PM

I have 8 gigs of ram. I have a Corsair 600w psu. And I re-installed drivers with drive sweeper multiple times. I also reseated them aswell. And my cards are at stock.
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a b à CPUs
August 15, 2013 9:49:56 PM

this seems to be a bios (Basic Input/Output System) issue. that is where the pcie lanes should be recognized at.

I would try and do a clear cmos. that will reset your bios for real and make it relook at everything.


ohh look i think you even may have a button for it. i was just looking at your board diagram to show you where it was in case of unfamiliarity.

it is right next to your usb 2.0 ports

now you do not have to use a jumper on your mainboard
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a b à CPUs
August 15, 2013 11:05:17 PM

Frame pacing on the 13.8 drivers does not work in DirectX 9 games, i.e COD:MW and CS:GO.
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August 15, 2013 11:10:06 PM

17seconds said:
Frame pacing on the 13.8 drivers does not work in DirectX 9 games, i.e COD:MW and CS:GO.


But I shouldn't be getting terrible performance? Frame pacing off does not affect performance for me.
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a b à CPUs
August 16, 2013 12:12:07 AM

Quantum- said:
I just did a GPU-Z Render test, and it said my second GPU was PCI e x16 @ x1 2.0, while the other is PCI e x16 @ x8 2.0 Why is my second one read as x1, they should both be x8/x8.


I still think this is the root of your issues. someplace along the line i think the bios failed to see your second card properly and pushing your clr cmos button i think will do the trick.

all this does is do a true factory reset on your bios.

here is the page from your owners manual
2.9 Jumpers Setup
The illustration shows how jumpers are
setup. When the jumper cap is placed on
pins, the jumper is “Short”. If no jumper cap
is placed on pins, the jumper is “Open”. The
illustration shows a 3-pin jumper whose
pin1 and pin2 are “Short” when jumper cap
is placed on these 2 pins.
Jumper Setting
Clear CMOS Jumper
(CLRCMOS1)
(see p.12, No. 19)
Note: CLRCMOS1 allows you to clear the data in CMOS. The data in CMOS includes
system setup information such as system password, date, time, and
system setup parameters. To clear and reset the system parameters to default
setup, please turn off the computer and unplug the power cord from the
power supply. After waiting for 15 seconds, use a jumper cap to short pin2
and pin3 on CLRCMOS1 for 5 seconds. However, please do not clear the
CMOS right after you update the BIOS. If you need to clear the CMOS when
you just f nish updating the BIOS, you must boot up the system f rst, and then
shut it down before you do the clear-CMOS action.

you do not need to use a jumper because you have a button.. that was the next line in your manual
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August 16, 2013 12:24:38 AM

fkr said:
Quantum- said:
I just did a GPU-Z Render test, and it said my second GPU was PCI e x16 @ x1 2.0, while the other is PCI e x16 @ x8 2.0 Why is my second one read as x1, they should both be x8/x8.


I still think this is the root of your issues. someplace along the line i think the bios failed to see your second card properly and pushing your clr cmos button i think will do the trick.

all this does is do a true factory reset on your bios.

here is the page from your owners manual
2.9 Jumpers Setup
The illustration shows how jumpers are
setup. When the jumper cap is placed on
pins, the jumper is “Short”. If no jumper cap
is placed on pins, the jumper is “Open”. The
illustration shows a 3-pin jumper whose
pin1 and pin2 are “Short” when jumper cap
is placed on these 2 pins.
Jumper Setting
Clear CMOS Jumper
(CLRCMOS1)
(see p.12, No. 19)
Note: CLRCMOS1 allows you to clear the data in CMOS. The data in CMOS includes
system setup information such as system password, date, time, and
system setup parameters. To clear and reset the system parameters to default
setup, please turn off the computer and unplug the power cord from the
power supply. After waiting for 15 seconds, use a jumper cap to short pin2
and pin3 on CLRCMOS1 for 5 seconds. However, please do not clear the
CMOS right after you update the BIOS. If you need to clear the CMOS when
you just f nish updating the BIOS, you must boot up the system f rst, and then
shut it down before you do the clear-CMOS action.


I am going to try this now. Will get back to you in a sec.
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August 16, 2013 12:37:25 AM

Ok I did this, and it is still the same. When I was testing games my first gpu has very little usage, and the second one always has 99. Don't know why.
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a b à CPUs
August 16, 2013 2:30:40 AM

crap.undo the crossfire cable and plug into just the card that is not registering as a pcie 8x. does it work then.

is your cpu back up to 100% usage?

also is one of the gpu registering as pcie 1x

If this keeps up I will run out of ideas to test and you may just have to contact the manufacturer.
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August 16, 2013 8:04:57 AM

It is a crossfire bridge, bot cable. No my cpu is not bottlenecking. Yes one is registering as pcie x1
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a b à CPUs
August 16, 2013 11:01:47 AM

Make sure your motherboard drivers are up to date.
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a b à CPUs
August 16, 2013 2:58:08 PM

Quantum- said:
It is a crossfire bridge, bot cable. No my cpu is not bottlenecking. Yes one is registering as pcie x1


but if you remove the crossfire bridge(or cable since all cables bridge two or more devices just a matter of semantics) and the whole card for that matter, what happens with just that one card in that same slot. i want to see if it scales back up.

i just want to know if that pcie lane may be faulty.
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