Upgraded to GTX690 - Page 2

Batalov · 2013-03-20, 01:16

Quote:

Originally Posted by Chuck

So why do you suppose they do this? Why not just use the two 6-pin connectors? Fortunately my machine came with a big powerful PSU and a bunch of sheathed cables, so I had both kinds.

Well, there's a reason behind it. The 8-pin PCI-E cable (if it conforms to standard), should have thicker wires (esp. the yellow "hot" ones; the black wires could be the same gauge as usual, after all there's five of them). You did the right thing.

By standard, the 6-pin connector is rated 75W, and the 8-pin, 150W. If the two side pins will stay in the air, the card will think "I cannot be sure that these wires won't smoke" and will signal that via the PCI bus to the BIOS, which will then beep X times and will power down.

In practice, for the PSUs that I've seen, you won't tell the difference between marksmanship of the 6-pin and 8-pin cables; they might as well be all the same gauge. Ymmv, though. The idea is clear though: they wanted to be able to have two standards. (They also have a coded combination of square and round pegs and tunnels, so that a user won't be able to plug upside down and/or 6-pin into 8-pin with a shift.)

I bothered to solder my own cable (instead of the 2xMOLEX->8-pin that was included), so I decided to chime. ;-)

Chuck · 2013-03-25, 13:57

I raised the GPU clock with EVGA Precision X by 70 to 1090 MHz; temps are still around 70C and the GHz-d/d increased to about 340 for each half of the card. It could probably go higher.

Xyzzy · 2013-03-25, 14:46

We have not overclocked our 690. Both GPUs run at 1058MHz, with the warmer one occasionally dropping down to 1045MHz. We have seen the cooler one go up to 1071MHz a few times.

Chuck · 2013-04-16, 00:04

I added a second one I bought used from a member of this forum. My motherboard had the PCIe slots too closely spaced, so I got a ribbon cable (came on a SLOW boat from China, ordered from Ebay) and hung the second card from the chassis so as to give better air circulation.

MFAKTC is managing the installation without a hitch.

2013-03-25, 13:57	#13
Chuck May 2011 Orange Park, FL 1640₈ Posts	Increased GPU clock I raised the GPU clock with EVGA Precision X by 70 to 1090 MHz; temps are still around 70C and the GHz-d/d increased to about 340 for each half of the card. It could probably go higher. Attached Thumbnails

2013-04-16, 00:04	#15
Chuck May 2011 Orange Park, FL 2⁵×29 Posts	Added a second GTX690 I added a second one I bought used from a member of this forum. My motherboard had the PCIe slots too closely spaced, so I got a ribbon cable (came on a SLOW boat from China, ordered from Ebay) and hung the second card from the chassis so as to give better air circulation. MFAKTC is managing the installation without a hitch. Attached Thumbnails

2013-03-25, 14:46	#14
Xyzzy Aug 2002 2×3²×13×37 Posts	We have not overclocked our 690. Both GPUs run at 1058MHz, with the warmer one occasionally dropping down to 1045MHz. We have seen the cooler one go up to 1071MHz a few times.