Radeon HD 7870 "Tahiti LE" Can Pair with HD 7900 Series in CrossFireX

btarunr · Dec 7, 2012, 02:45 PM

While testing Club 3D Radeon HD 7870 jokerCard, one of the three Radeon HD 7870 "Tahiti LE" graphics cards you can buy, we discovered that it can pair with Radeon HD 7900 series cards in CrossFireX. Our VGA testing lab, which has battened down the hatches for winter (lack of VGA launches), spent a lot of time toying with Club 3D's card and while brainstorming for the review's conclusion, it came up that HD 7870 Tahiti LE is "bad" because it can't pair with common HD 7870 or HD 7850 "Pitcairn" graphics cards. A bulb supernova just went off over our heads: "...sure Tahiti LE won't pair with Pitcairn, but will it pair with HD 7900 series "Tahiti", which have more stream processors, and more memory?" The answer turned out to be yes!

We successfully managed to pair the Club 3D HD 7870 jokerCard with a Radeon HD 7950 and HD 7970 (reference). We casually put it through 3DMark 11 and Sleeping Dogs, and found the contraptions to scale fairly well. We noticed some micro-stutter in 3DMark 11, but Sleeping Dogs felt smooth. This could be great news for current HD 7900 series owners who can upgrade to CrossFire for a modest $249~269. We even tried our luck at unlocking disabled shaders (stream processors), which didn't work. AMD used the mod-proof fuses method to lock the shaders. Check out our Club 3D HD 7870 jokerCard review.

RCoon · Dec 7, 2012, 02:46 PM

Of course it will pair with the 7900 series, its essentially a sucky 7950 anyway right?

brandonwh64 · Dec 7, 2012, 02:46 PM

Hmmm this has me thinking that the LE can be unlocked some how with shader count...

btarunr · Dec 7, 2012, 02:47 PM

Quote:

Originally Posted by RCoon

Of course it will pair with the 7900 series, its essentially a sucky 7950 anyway right?

Normally, we'd think it shouldn't because memory amount/bus/ lack of parity. Hence the excitement.

Quote:

Originally Posted by brandonwh64

Hmmm this has me thinking that the LE can be unlocked some how with shader count...

W1zzard is working on that.

RCoon · Dec 7, 2012, 02:50 PM

Quote:

Originally Posted by btarunr

Normally, we'd think it shouldn't because memory amount/bus/ lack of parity. Hence the excitement.

W1zzard is working on that.

I see, in which case i look forward to seeing people buy two 7870LE's and crossfiring them at 7950 speeds for a substantially low cost xD

btarunr · Dec 7, 2012, 02:51 PM

Quote:

Originally Posted by RCoon

I see, in which case i look forward to seeing people buy two 7870LE's and crossfiring them at 7950 speeds for a substantially low cost xD

Exactly.

RCoon · Dec 7, 2012, 02:52 PM

Quote:

Originally Posted by btarunr

Exactly.

Can you give us a sneaky bit of info on how the cooler performs? EDIT: when it's in that crossfire

m1dg3t · Dec 7, 2012, 02:54 PM

Pretty cool! Nice going there W1zz

btarunr · Dec 7, 2012, 02:56 PM

Quote:

Originally Posted by RCoon

Can you give us a sneaky bit of info on how the cooler performs? EDIT: when it's in that crossfire

Haven't done testing with that crossfire setup, but it's far from being the quietest card in its class.

INSTG8R · Dec 7, 2012, 03:00 PM

Interesting. Very keen on seeing the results. Might even make me dip my toe back into the water with Crossfire(Last time was WAYYY back with X1900XT's) If they scale well seems like a great deal.

Not keen on using Club3D, wonder if Sapphire is gonna do any Tahiti LE's.

btarunr · Dec 7, 2012, 03:03 PM

Quote:

Originally Posted by INSTG8R

Interesting. Very keen on seeing the results. Might even make me dip my toe back into the water with Crossfire(Last time was WAYYY back with X1900XT's) If they scale well seems like a great deal.

Not keen on using Club3D, wonder if Sapphire is gonna do any Tahiti LE's.

Sapphire won't do a Tahiti LE. They hate it. The only other brands are PowerColor (HD 7870 Myst) and VTX3D, and those cards are virtually identical to Club3D's card, since they're made on the same exact production line (TUL).

cadaveca · Dec 7, 2012, 03:05 PM

I was hoping for a GTO model.

Still, good info, can't wait for the review!

btarunr · Dec 7, 2012, 03:06 PM

Quote:

Originally Posted by cadaveca

can't wait for the review!

You don't have to

cadaveca · Dec 7, 2012, 03:21 PM

Quote:

Originally Posted by btarunr

You don't have to

BTA>>>ME

I like to wait anyway. I mean, you already know I'm a bit off-kilter...

Frick · Dec 7, 2012, 03:32 PM

Quote:

Originally Posted by cadaveca

I was hoping for a GTO model.

Still, good info, can't wait for the review!

That would have been nice. GTO + unlocks would be awesome.

Socram13 · Dec 7, 2012, 03:41 PM

I´m waiting for that 7870 LE review for some weeks, hope that it manages to be on pair with GTX 660 Ti.

3870x2 · Dec 7, 2012, 03:43 PM

Can the 7950 be unlocked to 7970? Sorry for the ignorance, I haven't done my homework.

W1zzard · Dec 7, 2012, 03:58 PM

Quote:

Originally Posted by 3870x2

Can the 7950 be unlocked to 7970? Sorry for the ignorance, I haven't done my homework.

No. there are no shader unlocks for HD 7000 Series

Widjaja · Dec 7, 2012, 04:10 PM

Will be interesting to see the review for this card.

W1zzard · Dec 7, 2012, 04:17 PM

Quote:

Originally Posted by Widjaja

Will be interesting to see the review for this card.

review is up: http://www.techpowerup.com/reviews/C...ard_Tahiti_LE/

m1dg3t · Dec 7, 2012, 05:15 PM

Quote:

Originally Posted by W1zzard

No. there are no shader unlocks for HD 7000 Series

The stop gaps are on the silicone level?

For example, the 7950 I have, is identical physically in appearance to a referrence 7970 but there is no chance of getting it to function as such?

cadaveca · Dec 7, 2012, 05:18 PM

Quote:

Originally Posted by m1dg3t

The stop gaps are on the silicone level?

For example, the 7950 I have, is identical physically in appearance to a referrence 7970 but there is no chance of getting it to function as such?

Nope. I'm running a 7970 BIOS anyway, makes ZERO difference, except in "stock" clocks and voltages.

I kinda thought maybe they hid some PCB bridge under the metal ring that goes around the core or something, but getting that off isn't going to be very easy. It really does seem as though there are actual physical disabling of the core, and how or where is not easily found.

W1zzard · Dec 7, 2012, 05:25 PM

There are fuses inside the die that can be blown in the late production process. This is a permanent change.

WarEagleAU · Dec 7, 2012, 11:48 PM

IF W1zzard manages to unlock the cores and what have you, what essentially brought me to TPU back in 2006 the Radeon unlocking of an X850, will be huge. I would definitely upgrade my 6870 to a 7870 LE no problem

T4C Fantasy · Dec 8, 2012, 02:55 AM

did anyone notice tahiti LE is a cayman substrant clone?

looks just like the 1536 core hd6970 chip, i know how amd cheapened costs here ^^

http://www.techpowerup.com/gpudb/186...D_7870_XT.html

http://www.techpowerup.com/gpudb/258..._2.0_x16).html

Dec 7, 2012, 02:45 PM	#1
btarunr Editor & Senior Moderator Join Date: Oct 2007 Location: Hyderabad, India Posts: 15,033 (7.23/day) Thanks: 790 Thanked 13,032 Times in 5,720 Posts System Specs	Radeon HD 7870 "Tahiti LE" Can Pair with HD 7900 Series in CrossFireX While testing Club 3D Radeon HD 7870 jokerCard, one of the three Radeon HD 7870 "Tahiti LE" graphics cards you can buy, we discovered that it can pair with Radeon HD 7900 series cards in CrossFireX. Our VGA testing lab, which has battened down the hatches for winter (lack of VGA launches), spent a lot of time toying with Club 3D's card and while brainstorming for the review's conclusion, it came up that HD 7870 Tahiti LE is "bad" because it can't pair with common HD 7870 or HD 7850 "Pitcairn" graphics cards. A bulb supernova just went off over our heads: "...sure Tahiti LE won't pair with Pitcairn, but will it pair with HD 7900 series "Tahiti", which have more stream processors, and more memory?" The answer turned out to be yes! We successfully managed to pair the Club 3D HD 7870 jokerCard with a Radeon HD 7950 and HD 7970 (reference). We casually put it through 3DMark 11 and Sleeping Dogs, and found the contraptions to scale fairly well. We noticed some micro-stutter in 3DMark 11, but Sleeping Dogs felt smooth. This could be great news for current HD 7900 series owners who can upgrade to CrossFire for a modest $249~269. We even tried our luck at unlocking disabled shaders (stream processors), which didn't work. AMD used the mod-proof fuses method to lock the shaders. Check out our Club 3D HD 7870 jokerCard review. Last edited by btarunr; Dec 7, 2012 at 04:02 PM.

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Dec 7, 2012, 02:46 PM	#2
RCoon Join Date: Apr 2012 Location: Grantham, Lincolnshire, UK Posts: 1,525 (3.58/day) Thanks: 169 Thanked 518 Times in 376 Posts System Specs	Of course it will pair with the 7900 series, its essentially a sucky 7950 anyway right? __________________ "So many times I wanted to move about (make poop but can't leave the game because it's online)" - Underworld

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Dec 7, 2012, 02:46 PM	#3
brandonwh64 Addicted to Bacon and StarCrunches!!! Join Date: Sep 2009 Location: Chatsworth, GA Posts: 13,667 (9.89/day) Thanks: 2,165 Thanked 5,382 Times in 3,729 Posts System Specs	Hmmm this has me thinking that the LE can be unlocked some how with shader count... __________________ Cruncher's: All GPU's GPU's: 7970 3GB = 8 Threads 5770 1GB OCed = 2 Threads

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Dec 7, 2012, 02:54 PM	#8
m1dg3t Join Date: May 2010 Location: Canada Posts: 2,003 (1.78/day) Thanks: 684 Thanked 453 Times in 375 Posts System Specs	Pretty cool! Nice going there W1zz __________________ Why dazzle 'em with brilliance when you can baffle 'em with bullshit. Alterius non sit, qui potest esse sui! Und setzet ihr nicht das leben ein, Nie wird euch das leben gewonnen sein! If knowledge is power, then ignorance is bliss! If god didn't want them sheared, he wouldn't have made them sheep!

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Dec 7, 2012, 03:00 PM	#10
INSTG8R Join Date: Nov 2004 Location: Lost in Norway Posts: 2,582 (0.83/day) Thanks: 936 Thanked 378 Times in 320 Posts System Specs	Interesting. Very keen on seeing the results. Might even make me dip my toe back into the water with Crossfire(Last time was WAYYY back with X1900XT's) If they scale well seems like a great deal. Not keen on using Club3D, wonder if Sapphire is gonna do any Tahiti LE's. __________________ Sys. Specs. i7 2600K@4.6\|ASUS P67 Sabertooth\|2x4096 Corsair Vengence 1600 \|Sapphire HD7970 OC\|WD Caviar Black 6.0Gbps 1TB x2@RAID 0\|SB X-Fi Fatality Pro\|TT Toughpower 1.2kW\|TT Kandalf L.C.S.\|Acer V243H 24" 1920x1080\|Logitech G25\|Logitech G500\|Logitech G19\|Saitek X-52 Pro\|TrackIR4 w/Trackclip Pro

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Dec 7, 2012, 03:05 PM	#12
cadaveca My name is Dave Join Date: Apr 2006 Location: The Great White North Posts: 10,930 (4.16/day) Thanks: 4,714 Thanked 5,454 Times in 3,304 Posts System Specs	I was hoping for a GTO model. Still, good info, can't wait for the review! __________________ Gadgets, Phones, Tablets, Cameras, TVs, HiFi...NextPowerUp -Only real men play games THIS way.

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Dec 7, 2012, 03:41 PM	#16
Socram13 Join Date: Feb 2011 Posts: 17 (0.02/day) Thanks: 1 Thanked 0 Times in 0 Posts System Specs	I´m waiting for that 7870 LE review for some weeks, hope that it manages to be on pair with GTX 660 Ti.

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Dec 7, 2012, 03:43 PM	#17
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Dec 7, 2012, 04:10 PM	#19
Widjaja Join Date: Jun 2007 Location: Wangas, New Zealand Posts: 4,058 (1.85/day) Thanks: 244 Thanked 632 Times in 547 Posts System Specs	Will be interesting to see the review for this card.

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Dec 7, 2012, 05:25 PM	#23
W1zzard Benevolent Dictator Join Date: May 2004 Location: Stuttgart, Germany Posts: 13,870 (4.17/day) Thanks: 184 Thanked 10,453 Times in 3,219 Posts System Specs	There are fuses inside the die that can be blown in the late production process. This is a permanent change.

Dec 7, 2012, 11:48 PM	#24
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Dec 8, 2012, 02:55 AM	#25
T4C Fantasy CPU & GPU DB Maintainer Join Date: May 2012 Location: USA, Rhode Island Posts: 891 (2.18/day) Thanks: 215 Thanked 380 Times in 223 Posts System Specs	did anyone notice tahiti LE is a cayman substrant clone? looks just like the 1536 core hd6970 chip, i know how amd cheapened costs here ^^ http://www.techpowerup.com/gpudb/186...D_7870_XT.html http://www.techpowerup.com/gpudb/258..._2.0_x16).html __________________ GPU Database <-- Want Me To Add A Specific Non-Reference GPU Model Not Listed? Send Me A PM GPU Database Thread Rare GPUs / Unreleased GPUs List Your Favorite GPU GPU-Z 0.6.7+ Screenshots! CPU Database

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