Still no one can tell me whether the share pcie with others will reduce in performance ?

my idle as low as 37', max under 80' if not mistaken

im using leadtek gtx670 which is on reference design, my idle is same as urs 37, but max load can reach 83 

83C on max load for a reference card is pretty normal.

A 670 PE on the other hand has excellent temp profile, but at the expense of louder fans, according to reviews. But to be honest, i barely hear anything louder than my single F12 PWM casing fan (exhaust). My PE running at stock non-OC speeds with auto fan settings, idle = 35C, max = 69C (running BF3).

nice temp u guys have there, i'll try to invest more on the chassis cooling then ... more n more fans ... 

ah so it's under 70' not 80' i forgot about my card

more fans = noisier

But yours is manually OC'ed further, so it's normal if the temp is higher a bit.

Not necessarily i think. Cuz in my setup, x3 200mm fans, even with high setting they dont make noise at all.

nice temp u guys have there, i'll try to invest more on the chassis cooling then ... more n more fans ... 

shiat after switching to full HD 1080 24" monitor, the 680 performance is still strong with 50+- fps in battlefield 3.

it is time to change lcd,mine is not full hd

ASUS' Republic of Gamers MARS III dual-GeForce GTX 680 graphics card may have been extensively covered at this year's Computex event, but very few have had a peek at its innards (PCB). Expreview posted pictures of the card's PCB, sourced from the manufacturer.

The pictures reveal an unusually long and tall PCB, which draws power from three 8-pin PCIe power connectors, a 21-phase VRM that uses Super Alloy chokes and driver-MOSFETs, PLX PEX8747 PCI-Express 3.0 x48 bridge chip, and of course the two GK104 GPUs with a total of 32 individual GDDR5 memory chips (16 for each GPU, 16 on each side of the PCB) wired to them, totaling 8 GB of memory.

We received an update from ASUS, clarifying that this card will not be released. The design was only displayed during a factory tour, to show ASUS craftmanship.

PE stable OC at 1340mhz? Highest Ive tried for mine is 1350mhz, scared to go higher though i know its possible. 

more fans = noisier

A reference 670 uses a centrifugal fan (aka blower) that directly expels out the hot air (from cooling the GPU) from your casing. So i guess adding more chassis fans wouldn't help much. A typical two fan setup, one as intake, and one as exhaust should be enough.

Non-reference design usually does not expel all the hot air out from the casing. There are some that retains inside the casing, so good casing ventilation is important.

680 got 2GB mem mang..... go for 1080 lorr.... still strong!

shiat after switching to full HD 1080 24" monitor, the 680 performance is still strong with 50+- fps in battlefield 3.