These are the ones that one user in this forum recently had trouble with. I think one of the lanes actually caught on fire. But I can't find the friggin thread right now, I know it was called something like "PCIE extension risers NOT to buy".
When I was searching for risers myself, I found an ebay auction where exactly these were sold but the Seller said in the description that they don't run with his mainboard which was the same as mine (MSI GD70)
So I kept searching and found these:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=220808834813&ssPageName=STRK:MEWAX:IT
They make a very reliable and solid appeal and the lanes are double, that's what one of the guys said was missing at the other one and because of this they started to burn. At least they run perfectly with my rigs, no trouble so far.
EDIT
lol didn't even think of clicking the link above
There you have it. But why won't the search find this thread..? 
When I was searching for risers myself, I found an ebay auction where exactly these were sold but the Seller said in the description that they don't run with his mainboard which was the same as mine (MSI GD70)
So I kept searching and found these:http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=220808834813&ssPageName=STRK:MEWAX:IT
They make a very reliable and solid appeal and the lanes are double, that's what one of the guys said was missing at the other one and because of this they started to burn. At least they run perfectly with my rigs, no trouble so far.
EDIT
lol didn't even think of clicking the link above
There you have it. But why won't the search find this thread..?