ok maybe someone can help me understand

overclocking101 · Feb 20, 2010

so I have 2 HD4890's in crossfire. my evga p55 motherboard is retarded and has the pcie 2.0 X16 slots to far away for crossfire bridge. I ordered a longer one online today. but in the meantime there is a second pcie X16 slot that will allow the card to run in crossfire but it switches it over to pcie X4 now during benches and such it actually seems as though my gpu performance is less than just the 1 card! WTF?!?! also in this slot GPU-z does not show the vreg sensors whatoever so no voltage controll. why?? the card is running and is detected and crossfire is enabled. but the 2nd card just runs in X4 mode. this should not do this right?? if I put the card in the bottom 2.0 X16 slot it runs and dectects normally with vreg sensors and voltage controll but i cannot run crossfire due to the crossfire bridges being to short. I thought about soldring 2 bridges together until my new on comes but honestly i dont think that possible. annybody help please?? maybe shed some light as to why this is doing this??

newmodder · Feb 20, 2010

just looked on the website and it looks like it only comes an SLI bridge, and looks like you would have to order the crossfire bridge.

MRCL · Feb 20, 2010

Sure its switches to x4. Its in the mobos description.

evga.com said:
Expansion Slot
2 x PCIe x16/x8, 1 x PCIe x4, 1 x PCIe x1
2 x 32-bit PCI, support for PCI 2.1

Its a bit silly to for them to make the middle slot the x4 one thats true.

Interestingly enough, my p55 SLI has the x4 at the bottom where it belongs

Some evga bloke didn't pay enough attention I assume, or it was his last day or something.

overclocking101 · Feb 20, 2010

yeah. it just doesnt make sense that it would hinder performance like this. oh well i guess

Mussels · Feb 20, 2010

that other slot you're using is likely running off the soutbridge or something, and not the northbridge. added latency between GPU's could slow down performance drastically.

overclocking101 · Feb 20, 2010

well it is running off the p55 southbridge I do believe but I figured out the problem and its really stupid. I forgot to plug the molex power connector into the motherboard for added PCI-E volts/stability. and well when I did wham! works now!

Mussels · Feb 21, 2010

lol!

what a simple problem, yet conveniently solved

System Name	The wifes worst enemy
Processor	i5-9600k
Motherboard	Asrock z390 phantom gaming 4
Cooling	water
Memory	16gb G.skill ripjaw DDR4 2400 4X4GB 15-15-15-35-2T
Video Card(s)	Asrock 5600xt phantom gaming 6gb 14gb/s
Storage	crucial M500 120GB SSD, Pny 256GB SSD, seagate 750GB, seagate 2TB HDD, WD blue 1TB 2.5" HDD
Display(s)	27 inch samsung @ 1080p but capable of much more ;)
Case	Corsair AIR 540 Cube Mid tower
Audio Device(s)	onboard
Power Supply	EVGA GQ1000W MODULAR
Mouse	generic for now
Keyboard	generic for now
Software	gotta love steam, origin etc etc
Benchmark Scores	http://hwbot.org/user/philbrown_23/

System Name	Gamer
Processor	amd phenom quad core 9950 black edition
Motherboard	msi ms-7309
Cooling	120mm front,120mm rear
Memory	2gigs ddr2 800
Video Card(s)	BFG gtx 260 maxcore
Storage	wd 160gig sata2 hd
Display(s)	LG 20in widescreen
Case	USP 100
Audio Device(s)	onboard Logitech x-530 5.1 spkrs
Power Supply	Antec Neo 550watt
Software	windows 7 Ultimate 64 bit

System Name	Fractality 1.0
Processor	Intel Core i7-860 @ 3.6GHz
Motherboard	EVGA P55 SLI
Cooling	Prolimatech Megahalems and four Fractal Design 120mm fans, sleeved
Memory	16GB Kingston Hyper RAM
Video Card(s)	PNY GeForce 580 XLR8
Storage	64GB and 180GB SSDs / 1TB and 2TB HDDs
Display(s)	24" Acer V243W
Case	Fractal Design Define R2, sleeved all I/O cables
Audio Device(s)	onboard
Power Supply	Corsair HX750W modular, sadly only stock sleeving
Software	Win 7 64bit

System Name	The wifes worst enemy
Processor	i5-9600k
Motherboard	Asrock z390 phantom gaming 4
Cooling	water
Memory	16gb G.skill ripjaw DDR4 2400 4X4GB 15-15-15-35-2T
Video Card(s)	Asrock 5600xt phantom gaming 6gb 14gb/s
Storage	crucial M500 120GB SSD, Pny 256GB SSD, seagate 750GB, seagate 2TB HDD, WD blue 1TB 2.5" HDD
Display(s)	27 inch samsung @ 1080p but capable of much more ;)
Case	Corsair AIR 540 Cube Mid tower
Audio Device(s)	onboard
Power Supply	EVGA GQ1000W MODULAR
Mouse	generic for now
Keyboard	generic for now
Software	gotta love steam, origin etc etc
Benchmark Scores	http://hwbot.org/user/philbrown_23/

System Name	Rainbow Sparkles (Power efficient, <350W gaming load)
Processor	Ryzen R7 5800x3D (Undervolted, 4.45GHz all core)
Motherboard	Asus x570-F (BIOS Modded)
Cooling	Alphacool Apex UV - Alphacool Eisblock XPX Aurora + EK Quantum ARGB 3090 w/ active backplate
Memory	2x32GB DDR4 3600 Corsair Vengeance RGB @3866 C18-22-22-22-42 TRFC704 (1.4V Hynix MJR - SoC 1.15V)
Video Card(s)	Galax RTX 3090 SG 24GB: Underclocked to 1700Mhz 0.750v (375W down to 250W))
Storage	2TB WD SN850 NVME + 1TB Sasmsung 970 Pro NVME + 1TB Intel 6000P NVME USB 3.2
Display(s)	Phillips 32 32M1N5800A (4k144), LG 32" (4K60) \| Gigabyte G32QC (2k165) \| Phillips 328m6fjrmb (2K144)
Case	Fractal Design R6
Audio Device(s)	Logitech G560 \| Corsair Void pro RGB \|Blue Yeti mic
Power Supply	Fractal Ion+ 2 860W (Platinum) (This thing is God-tier. Silent and TINY)
Mouse	Logitech G Pro wireless + Steelseries Prisma XL
Keyboard	Razer Huntsman TE ( Sexy white keycaps)
VR HMD	Oculus Rift S + Quest 2
Software	Windows 11 pro x64 (Yes, it's genuinely a good OS) OpenRGB - ditch the branded bloatware!
Benchmark Scores	Nyooom.

ok maybe someone can help me understand

overclocking101

newmodder

New Member

MRCL

overclocking101

Mussels

Freshwater Moderator

overclocking101

Mussels

Freshwater Moderator