i have mobo with pcie 3.0 x16 the other one is 2.0 x4

ATI7000 · May 30, 2014

i wanna CrossF sapphire r9 270x will it hurt the perofrmance i just dont knowwho to belive everyone says something diffrent how many % performance will i get heres my rig My setup

Windows 7 64bit

i5-3330 CPU @ 3.00GHz, 3201 Mhz, with turbo boost

Gigabyte B75 MB 3.0 x16 the other one is 2.0 x4

8.00 GB HyperX 1600mhz

Sapphire R9 270x dual-x 2gb 1070 boost core memory 1400 Catalyst Version 14.4 PCIE 3.0

samsung spine point3 500mg 16m 7200rpm

deepcool 400 gammax

Series P1-650B-BEFX psu

V9 BlacX Edition Case

i was told i will get 10-15 % perofrmance depends on the Game plz help

clutchc · May 30, 2014

If your 2nd PCIe X16 slot is only X4 lanes, I would avoid using a 2nd card. The bandwidth will suffer. The ver 2.0 however, is no problem Most (all?) cards today cannot saturate the bandwidth of 2.0.

ATI7000 · May 30, 2014

sorry i didnt understand your answer the x4 lane is ok to do cross fire ?

lowriderflow · May 30, 2014

2.0 4x, you'll be fine to crossfire a 270x.

you'd see no difference at all.

now if you were talking 290x, then you would start to notice it.

ATI7000 · May 30, 2014

i wanna know if i will see any performance + and if my CPU will bolltneck the cards ? there som tests on the web x4 x8 not really much diffrent few fps

ATI7000 · May 30, 2014

lowriderflow :

i wouldnt lose perofrmance or i wont see incress fps when gaming ?

Calnin · May 30, 2014

If you are crossfiring 270x, you'll notice a difference.

ATI7000 · May 30, 2014

so i will see difference in performance running on X4 lane its worth to do it

clutchc · May 30, 2014

You'll be sorry if you spend money on a 2nd card for a X4 lane slot. I have done this. I speak from experience. The slow slot will impede performance too much.

ATI7000 · May 30, 2014

i found this searching plz take look http://www.neowin.net/forum/topic/992460-what-does-x4-bandwidth-mean-on-a-pcie-20-x16-slot/

ATI7000 · May 30, 2014

so if one gpu is running on 3.0 x16 the other running on 2.0 x4 dose the 3.0 x16 drope down to diffrent number x8 x8 or x4 x4 or just x16 x4 ????

clutchc · May 30, 2014

ATI7000 :

I don't have time to read the entire thread/discussion. Perhaps you can sum it up for me. Nevertheless, I have read several articles that say it is sufficient at X4 to use a 2nd card. That is why I did it. But I am here to tell you they are wrong.

ATI7000 · May 30, 2014

Ivy Bridge Core processors said to work better in x4 lane is this true ?

ATI7000 · May 30, 2014

clutchc :

so it sucked ? that bad i mean how bad was it bro

clutchc · May 30, 2014

ATI7000 :

???? CPUs don't work in PCIe slots. They provide the PCIe slots their lanes. A PCIe slot at ver 2.0 is the same speed no matter what processor is being used.

ATI7000 · May 30, 2014

shit that means i need buy 3.0 x16 2.0 x8 right to see good diffrence

Calnin · May 30, 2014

The money investment into this isn't worth the outcome. I feel like your psu might not be able to support a crossfire in the first place.

clutchc · May 30, 2014

ATI7000 :

Stick with a fast single card.

ATI7000 · May 30, 2014

Series P1-650B-BEFX its not good psu ???? CFing

ATI7000 · May 30, 2014

clutchc :

i mean dont get me wrong the sapphie 270x dual X i maxed out any game i thow at it i just want it to use the lane that says crossfire ready its petty stupid i dont see why they do this shit

clutchc · May 30, 2014

ATI7000 :

If this is your PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817207031
It is high quality and would be OK for dual cards of that class. Normally, I like to see 750W or greater for dual cards, but that PSU would handle it.

ATI7000 · May 30, 2014

will thanx alot guys for the info peace

so this site is bullshit http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/1.html

Calnin · May 30, 2014

Oh i was mixing this thread and some other thread up, apologies. But, i still think that a 650 wouldn't be very good for crossfiring. like clutchc said, a 750 would probably be more appropriate. But that 650 can probably do it.

clutchc · May 30, 2014

ATI7000 :

Some games showed a very minor improvement over the single card. Some games actually resulted in slightly lower FPS than a single card. It wasn't pretty. This was several years ago. The cards were HD 6850s. But if it hampered HD 6850s, it would do more so with 270Xs. Plus back then micro-stutter was always present with 2 AMD cards. Thankfully that has been pretty well eliminated now.

ATI7000 · May 30, 2014

Calnin :

how about the case will it keep the heat out if i was to get new board x16 x8 ? the air flow

i have mobo with pcie 3.0 x16 the other one is 2.0 x4

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