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Tahiti Crossfire questions

post #1 of 7
Thread Starter 
Hi guys,

Firstly, I was thinking of buying a HD7870 Tahiti LE for crossfire - is this even possible ? I heard the LE can crossfire with the 7950 and 7970 since they are all based on the Tahiti chip so I thought that maybe a HD7870 LE could crossfire with the HD7990 so there are 3 GPU's ?

Secondly, is my 4.4GHz i5 4670K sufficient or will it be a bottleneck in gaming ? My resolution is 1920x1080 - yes I know this is quite low for three GPU's but new games with maxed settings and AA are getting quite intensive.

And lastly, will my Corsair HX850 watt PSU be enough ? The PSU calculators I have used say so, but I don't know how reliable those calculators are. I have already undervolted the HD7990 from 1200mV to 1125mV (still same stock clocks) so its power consumption is lower and Haswell seems to not use too much power.

Thanks for all your help.
Edited by Nyt Ryda - 11/9/13 at 12:32am
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post #2 of 7
bump
Edited by Spectre- - 11/9/13 at 12:50am
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post #3 of 7
edit- didnt read the le part

7870 le can esasily crossfire any 7000 series card ... only problem is it will limit your vram and lower your clock speeds

and hence it would crossfire with a 7950/7970//7990

about your CPU no its not a bottleneck

your PSU can power r9 290 crossfire which are more power hungry than anything in the 7000 series

so PSU is an ok[
Edited by Spectre- - 11/9/13 at 12:50am
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Spectre- View Post

unfortunately the 7870 is not in the same series as 7900
and hence it wont crossfire with a 7950/7970//7990

I know a normal Pitcairn HD7870 can't crossfire with the HD7900 series, but the HD7870 LE is based on the Tahiti core and cannot crossfire with other Pitcairn HD7870 but can it crossfire with the Tahiti HD7950s and HD797s0 - http://www.techpowerup.com/176817/radeon-hd-7870-tahiti-le-can-pair-with-hd-7900-series-in-crossfirex.html

Since it can crossfire with Tahiti HD7950s and HD7970s but can it crossfire with a HD7990 which is essentially two Tahiti HD7970s ?
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post #5 of 7
Quote:
Originally Posted by Nyt Ryda View Post

I know a normal Pitcairn HD7870 can't crossfire with the HD7900 series, but the HD7870 LE is based on the Tahiti core and cannot crossfire with other Pitcairn HD7870 but can it crossfire with the Tahiti HD7950s and HD797s0 - http://www.techpowerup.com/176817/radeon-hd-7870-tahiti-le-can-pair-with-hd-7900-series-in-crossfirex.html

Since it can crossfire with Tahiti HD7950s and HD7970s but can it crossfire with a HD7990 which is essentially two Tahiti HD7970s ?

theoretically the 7870le should crossfire with 7990

but the last time i mixed match 2 different vram cards it didnt work
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post #6 of 7
Quote:
Originally Posted by Nyt Ryda View Post

Firstly, I was thinking of buying a HD7870 Tahiti LE for crossfire - is this even possible ? I heard the LE can crossfire with the 7950 and 7970 since they are all based on the Tahiti chip so I thought that maybe a HD7870 LE could crossfire with the HD7990 so there are 3 GPU's ?

All possible, but not recommended.

Using cards of different performance levels adversely affects CFX scaling. It's probably not a major issue with a two GPU setup, but might make three scale too little to be worthwhile.
Quote:
Originally Posted by Spectre- View Post

unfortunately the 7870 is not in the same series as 7900

The 7870 LE is Tahiti, the same GPU as the 7900 series.
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post #7 of 7
Quote:
Originally Posted by Blameless View Post

All possible, but not recommended.

Using cards of different performance levels adversely affects CFX scaling. It's probably not a major issue with a two GPU setup, but might make three scale too little to be worthwhile.
The 7870 LE is Tahiti, the same GPU as the 7900 series.

i swear i edited ... maybe i double posted

poop
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Kingston Hyper X 240Gb 3K  Sandisk Ultra II 480gb  Sandisk Ultra II 960GB Custom Loop  
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SP 120 (x4) Windows 10 Professional  Benq XL2411T 144hz screen Acer AL1916W 
KeyboardPowerCaseMouse
Coolermaster Quickfire TK MX brown w/ ABS Clear... EVGA 750watts G2 Thermaltake Core P3  RAZER Imperator BF3 edition 
Mouse PadAudioAudioAudio
RAZER goliathus World of tanks edition Creative gigaworks T40 Series II E10K DAC DT 990 Pros  
AudioOtherOtherOther
Antlion Modmic  Xbox 360 controller windows Deepcool RGB kit NZXT GRID+  
CPUMotherboardGraphicsRAM
i5 3570 Asus P8Z77M-Pro Asus HD2400 G.Skill 4gb 1333 
Hard DriveHard DriveCoolingCooling
Toshiba 80gb (OS) 2 X 2TB Seagate Barracuda Coolermaster Evo 212 2X Xigamatek white LED fans 
OSMonitorKeyboardPower
Linux 3.2.0 \ Open media vault Dell 19 inch Dell OEM poop Coolermaster GS 650M 
Case
NZXT S340 (white) 
CPUMotherboardGraphicsRAM
i7 3820  Asus P9X79-LE Msi GTX 970  Ripjaws X 4 x 4gb 
Hard DriveHard DriveOptical DriveCooling
Samsung Evo 250gb WD 1TB Blue WD Raptors 150 GB RAID 0  Corsair SP 120 X 3 (quiet pwm) 
CoolingCoolingCoolingCooling
Noctua NF-P14S (x2) Alphacool UT60 120mm Alphacool ST30 240mm  Swiftech H320 block/pump 
OSMonitorMonitorKeyboard
W7X64 HP 1730 Acer XB2410H MAD CATZ STRIKE 3  
PowerCaseMouseMouse Pad
Antec HCG 900 NZXT Phantom 630 Cougar 900 Razer 
AudioAudioAudioOther
Creative T10  Audio Technica PG1  Asus U7 NZXT Hue  
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