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Sandwich 2x 7950's without issue?

post #1 of 9
Thread Starter 
The last time I sandwiched two Club3D 6950s, it was a nightmare. They used screws that were five feet tall and as a result, the cards never sat properly and the top card had three blades sheared off its fan when it sagged and hit the screws on the bottom card.

I plan to sandwich a pair of 7950s now.
No, I do not have a choice here. I cannot go ATX as the case will never fit under my table.

What do you guys think?
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post #2 of 9
If you are sandwiching two reference 7950s, I don't think it will be a problem.

Here's a guy sandwiching 3 7970s, which has a similar design to the 7950.

http://img.photobucket.com/albums/0603/stu@mdevelopments/PC%20benchmarking%202012/P1020556Medium.jpg
    
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post #3 of 9
Thread Starter 
The problem is that I may not be able to have access to reference cards.
Distributors in Singapore don't understand the fact that reference cards have an audience, however little.


Which are the non-reference cards that are safe to buy?
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post #4 of 9
Which ones do you have access to?
    
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post #5 of 9
Don't sandwich non reference cards. Only use a max of 1 non-ref card if you're going to sandwich. Set it up as the far left card so that it can breathe and use the other non-reference cards to the right of it.
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post #6 of 9
Thread Starter 
Quote:
Originally Posted by aoya View Post

Which ones do you have access to?

I'm not sure yet. At the moment everyone's snapped up everything and now we're struggling to restock.
Quote:
Originally Posted by m3t4lh34d View Post

Don't sandwich non reference cards. Only use a max of 1 non-ref card if you're going to sandwich. Set it up as the far left card so that it can breathe and use the other non-reference cards to the right of it.

I can't NOT sandwich them. I work at a business that specialises mATX builds, and sometimes we require sandwiching cards to get the performance that's required.

Of course, being an mATX board means that at the most, only two cards will be sandwiched. And if there's zero amount of reference cards, we'll have to squish two non-reference ones together.

No, shipping from overseas is not an option because sooner or later as well the non-reference stocks from overseas are going to run dry as well, and besides this store is run by just three people. We do not have the time (and financial resources) to handle continuous oversea shipping and other sorts of paperwork just so the card reaches its destination in one piece, and comes back to us safely.
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post #7 of 9
Maybe look into watercooling?
post #8 of 9
You could try some string or something to "pull" the cards away from each other. Sounds like you just need 2-3mm, which is something any decent quality PCB can handle. I did that with one of my 6970 Lightnings since it sagged so much the fans start knocking some parts on my sound card sitting just under it.

Should also mention that after about a month of the string's tension pulling the card up, it stayed in that position after I cut the string off. After, comparing PCBs, I found the card with string had a very much straight PCB, while the other one seemed a little bent.
post #9 of 9
Thread Starter 
Quote:
Originally Posted by audioxbliss View Post

You could try some string or something to "pull" the cards away from each other. Sounds like you just need 2-3mm, which is something any decent quality PCB can handle. I did that with one of my 6970 Lightnings since it sagged so much the fans start knocking some parts on my sound card sitting just under it.
Should also mention that after about a month of the string's tension pulling the card up, it stayed in that position after I cut the string off. After, comparing PCBs, I found the card with string had a very much straight PCB, while the other one seemed a little bent.

String is a good idea. I'll look into implementing that.

Meanwhile the onus is on me now to fix a pair of sagging Club3D 6950's which sag into each other.

And the five-foot tall screws are not helping. They don't even fit into adjacent slots.

/facepalm
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T8
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CPUMotherboardGraphicsRAM
Intel Core™ i5 2400 @ 3.0 ASROCK Z68 Pro 3 M AMD Radeon HD 6950 Shader Unlocked, @ 900/1400 2x KVR1333D3N9/4G 
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2x KVR1333D3N9/2G Plextor M5S 128GB Western Digital Caviar GreenPower WD5000AACS Western Digital Caviar WD2500JS 
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LiteON iHAS324 DVD-RW DL Thermaltake Water 2.0 Pro w/ AVC DS12025B12U Windows 7 Home Premium x64 Dell Ultrasharp U2211H 
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Rapoo V500 (Kailh Yellow) FSP Aurum AU-400 400W 80PLUS Gold CoolerMaster Silencio 352 CoolerMaster Storm SPAWN 
Audio
Fenda F&D H200 2.0 USB Powered 
CPUMotherboardGraphicsRAM
Intel Core i3 2100 @ 3.0 ASROCK Z68 Pro 3 M AMD Radeon HD 5770 1GD5 (Reference) 2x KVR1333D3N9/4G 
RAMHard DriveHard DriveOptical Drive
2x KVR1333D3N9/2G Transcend SSD370 128GB WD Scorpio Blue WD7500BPVT Samsung SH-223C 
CoolingCoolingOSMonitor
Thermaltake Water 3.0 Performer-C AKASA Ball Bearing Windows 7 Home Premium x64 Dell Ultrasharp U2311H 
KeyboardPowerCaseMouse
Armaggeddon Strike Eagle MKI-3 (Kailh Red) Dell (Foxconn) F320EM-00 320W 80PLUS Gold CoolerMaster Elite 341 CM Storm SPAWN 
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