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EAH4670 Software Crossfire

post #1 of 8
Thread Starter 
So I have an old Phenom II and AM3 board sitting around doing nothing along with x2 512MB EAH4670's without Crossfire connectors. I just recently learned that you can run these in "Software crossfire", and they actually run pretty well. Considering the limited VRAM and age, they manage to run games at playable frame rates and I was actually kind impressed on how they performed.

I'm considering giving this setup to a family member (a new overclocker thumb.gif) to let him get his feet wet and to have a little fun. However I came across a slight issue. The x2 cards run perfectly well together (GPU-Z reports both cards are running during benchmarking / gaming) but I cannot overclock them. As soon as I bump the clock and or mem speed up (even < 5Mhz) the second monitor will flicker when you do anything.

I initially ran just one monitor to bench or torture test, and everything was fine. The problem came when I connected the second monitor. With two monitors Primary (1600x900 DVI) and Secondary (1280x1024 VGA) the second monitor flickers when you do something on the primary monitor. For example, scrolling down a web page will cause the Secondary monitor to flash or flicker randomly.

Disabling AMD overdrive (back to stock clocks) it does not flicker at all. I've tried using adapters, DVI to HDMI and VGA to DVI with no success. Any overclock at all (on either card) will cause the secondary monitor to flicker. Since this will be a rig for my nephew to essentially learn about computers and overclocking, this would obviously be no fun, lol.

So far I've tried:

- Forcing a Profile in Catalyst
- ASUS GPU Tweak to Force 2D clocks
- 9.12 through 13.1 drivers
- Switching the cards around

Notes:

- Both cards are identical EAH4670 512MB (Same cooler, BIOS etc)
- Both cards max out around 65c using Furmark and benching
- Cards are running in x8 - x8
- Catalyst states both cards are running in crossfire, and I've confirmed that with GPU-Z.
- Each card on its own can run at about 850 / 920 stable.
- Stock CPU clocks and base clocks. Nothing is overclocked at all currently.
- Windows 7 x64 OS
- 2x2GB (dual channel) 1600Mhz ram.
- 430w PSU

Any ideas?
Edited by *ka24e* - 5/20/13 at 9:46pm
post #2 of 8
Thread Starter 
Anyone?
post #3 of 8
This might be silly, but.. Do the monitors run on the absolute same refresh rate?
Aaand have you tried downclocking a bit?
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MEGATRON
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CPUMotherboardGraphicsGraphics
Intel Core i5-3570K @ 4.8/1.32V | Hammer&Vice'd ASUS Sabertooth Z77 PowerColor R9 290 PowerColor R9 290 
RAMHard DriveHard DriveCooling
Samsung MV-3V4G3D/US 4x4GB kit @ 2200MHz 9-10-1... 2x Western Digital Caviar Black 1TB RAID 0 Samsung 840 Evo 250GB 2xAquacomputer Kryographics Hawaii Nickel/Acrylic 
CoolingCoolingCoolingCooling
XSPC Rasa Swiftech MCP-655 Vario Aquacomputer Aqualis 450mm w/ nano & Pump top 2x XSPC RX360; 1x XSPC RS360; 1x Alphacool ST 1... 
CoolingOSMonitorMonitor
EK-Vardar F4-120 8.1 x64; Ubuntu 14.10 Dell U2412M Dell U2412M 
MonitorMonitorKeyboardPower
Dell U2312H BenQ XL2411Z KBC Poker II MX Clears SeaSonic SS-850AM 
CaseMouseMouse PadAudio
Thermaltake Core X9 Mionix AVIOR 7000 Razer Goliathus Aune T1 -> Yamaha A-720 -> Sennheiser HD650 | S... 
CPUCPUMotherboardGraphics
Intel Xeon E5-2650 v4 @ 2.00GHz Intel Xeon E5-2650 v4 @ 2.00GHz SuperMicro X10DAL-i nay 
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2x8GB (for now) Kingston DDR4 @ 2133MHz/C16 Samsung 840 120GB EK-Vardar F4 on an Arctic Freezer i11 Ubuntu Server 16.04 
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post #4 of 8
Thread Starter 
Didn't think about the refresh rate. That would probably cause some issues, but unfortunately both monitors are @ 60Hhz.

I haven't tried down-clocking them (other than forcing 2D clocks lower and higher, made no difference). They run perfectly fine at stock speeds (750/900) but as soon as any overclock is applied no matter how small, the second monitor goes nuts.

What's the possibility of the CPU causing it?
post #5 of 8
I highly doubt it. However, I can't come up with anything useful.
Will update post if a lightbulb in my head goes on.
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MonitorMonitorKeyboardPower
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CaseMouseMouse PadAudio
Thermaltake Core X9 Mionix AVIOR 7000 Razer Goliathus Aune T1 -> Yamaha A-720 -> Sennheiser HD650 | S... 
CPUCPUMotherboardGraphics
Intel Xeon E5-2650 v4 @ 2.00GHz Intel Xeon E5-2650 v4 @ 2.00GHz SuperMicro X10DAL-i nay 
RAMHard DriveCoolingOS
2x8GB (for now) Kingston DDR4 @ 2133MHz/C16 Samsung 840 120GB EK-Vardar F4 on an Arctic Freezer i11 Ubuntu Server 16.04 
PowerCase
SeaSonic SS850-AM overrated 
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MEGATRON
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GIGATRON
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CPUMotherboardGraphicsGraphics
Intel Core i5-3570K @ 4.8/1.32V | Hammer&Vice'd ASUS Sabertooth Z77 PowerColor R9 290 PowerColor R9 290 
RAMHard DriveHard DriveCooling
Samsung MV-3V4G3D/US 4x4GB kit @ 2200MHz 9-10-1... 2x Western Digital Caviar Black 1TB RAID 0 Samsung 840 Evo 250GB 2xAquacomputer Kryographics Hawaii Nickel/Acrylic 
CoolingCoolingCoolingCooling
XSPC Rasa Swiftech MCP-655 Vario Aquacomputer Aqualis 450mm w/ nano & Pump top 2x XSPC RX360; 1x XSPC RS360; 1x Alphacool ST 1... 
CoolingOSMonitorMonitor
EK-Vardar F4-120 8.1 x64; Ubuntu 14.10 Dell U2412M Dell U2412M 
MonitorMonitorKeyboardPower
Dell U2312H BenQ XL2411Z KBC Poker II MX Clears SeaSonic SS-850AM 
CaseMouseMouse PadAudio
Thermaltake Core X9 Mionix AVIOR 7000 Razer Goliathus Aune T1 -> Yamaha A-720 -> Sennheiser HD650 | S... 
CPUCPUMotherboardGraphics
Intel Xeon E5-2650 v4 @ 2.00GHz Intel Xeon E5-2650 v4 @ 2.00GHz SuperMicro X10DAL-i nay 
RAMHard DriveCoolingOS
2x8GB (for now) Kingston DDR4 @ 2133MHz/C16 Samsung 840 120GB EK-Vardar F4 on an Arctic Freezer i11 Ubuntu Server 16.04 
PowerCase
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post #6 of 8
Thread Starter 
Eh, I gave up on this. I tried everything I could think of, tutorials etc and nothing seems to be working. I think I'll just sell these and just pick up a used 5xxx or 6xxx series.
post #7 of 8
I read around quite a bit, too, and can't really find anything fitting the situation or useful. :/
Sorry to hear that, mate.
But, oh well, it's going to be quite a decent upgrade for a small sum.

And you can find non top-end cards for close to free, so it's worth it to wait on the next gen, can you afford waiting. thumb.gif
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RAMHard DriveHard DriveCooling
Samsung MV-3V4G3D/US 4x4GB kit @ 2200MHz 9-10-1... 2x Western Digital Caviar Black 1TB RAID 0 Samsung 840 Evo 250GB 2xAquacomputer Kryographics Hawaii Nickel/Acrylic 
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XSPC Rasa Swiftech MCP-655 Vario Aquacomputer Aqualis 450mm w/ nano & Pump top 2x XSPC RX360; 1x XSPC RS360; 1x Alphacool ST 1... 
CoolingOSMonitorMonitor
EK-Vardar F4-120 8.1 x64; Ubuntu 14.10 Dell U2412M Dell U2412M 
MonitorMonitorKeyboardPower
Dell U2312H BenQ XL2411Z KBC Poker II MX Clears SeaSonic SS-850AM 
CaseMouseMouse PadAudio
Thermaltake Core X9 Mionix AVIOR 7000 Razer Goliathus Aune T1 -> Yamaha A-720 -> Sennheiser HD650 | S... 
CPUCPUMotherboardGraphics
Intel Xeon E5-2650 v4 @ 2.00GHz Intel Xeon E5-2650 v4 @ 2.00GHz SuperMicro X10DAL-i nay 
RAMHard DriveCoolingOS
2x8GB (for now) Kingston DDR4 @ 2133MHz/C16 Samsung 840 120GB EK-Vardar F4 on an Arctic Freezer i11 Ubuntu Server 16.04 
PowerCase
SeaSonic SS850-AM overrated 
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MEGATRON
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GIGATRON
(10 items)
 
 
CPUMotherboardGraphicsGraphics
Intel Core i5-3570K @ 4.8/1.32V | Hammer&Vice'd ASUS Sabertooth Z77 PowerColor R9 290 PowerColor R9 290 
RAMHard DriveHard DriveCooling
Samsung MV-3V4G3D/US 4x4GB kit @ 2200MHz 9-10-1... 2x Western Digital Caviar Black 1TB RAID 0 Samsung 840 Evo 250GB 2xAquacomputer Kryographics Hawaii Nickel/Acrylic 
CoolingCoolingCoolingCooling
XSPC Rasa Swiftech MCP-655 Vario Aquacomputer Aqualis 450mm w/ nano & Pump top 2x XSPC RX360; 1x XSPC RS360; 1x Alphacool ST 1... 
CoolingOSMonitorMonitor
EK-Vardar F4-120 8.1 x64; Ubuntu 14.10 Dell U2412M Dell U2412M 
MonitorMonitorKeyboardPower
Dell U2312H BenQ XL2411Z KBC Poker II MX Clears SeaSonic SS-850AM 
CaseMouseMouse PadAudio
Thermaltake Core X9 Mionix AVIOR 7000 Razer Goliathus Aune T1 -> Yamaha A-720 -> Sennheiser HD650 | S... 
CPUCPUMotherboardGraphics
Intel Xeon E5-2650 v4 @ 2.00GHz Intel Xeon E5-2650 v4 @ 2.00GHz SuperMicro X10DAL-i nay 
RAMHard DriveCoolingOS
2x8GB (for now) Kingston DDR4 @ 2133MHz/C16 Samsung 840 120GB EK-Vardar F4 on an Arctic Freezer i11 Ubuntu Server 16.04 
PowerCase
SeaSonic SS850-AM overrated 
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post #8 of 8
Thread Starter 
Well I'm not going to personally be using it. I use my sig rig below. The PII setup with x2 4670's will be going to a relative. Who knows, maybe he can fix it but if not I'll just go with a single card setup and call it a day. tongue.gif

Thank you for your help tho, + rep to you.
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