Unless your GPU has the mounting bracket or screws on the back, it shouldnt touch, thermalright design it asymmetrical so it wouldn't touch the first PCI slot, even the new Silver Arrow IBE will be the same measurement toward the PCIe slot. It has the same lenght from the center of the CPU socket to the end as the HR02, i used the HR02 on two builds on TJ08-E with gpus on the first pcie, and i also did another on PS-07, in all 3 builds is at mm but it doesn't touch unless the gpu is weight toward the CPU. On my latest build im using the HR22 (also used for couple of months the HR02) and i have a Intel CT Gigabit card on the first PCIe slot, and it doesn't touch, again its very close but its fine on all my builds. Ill leave you some pics to see what i mean.
A less wide cooler that its recommended by SPCR is the Scythe Mugen 4
, it should be less wide than the HR22/HR02, 130mm vs 140mm, so its like 5mm less per side, so thats what you will gain over the HR22, weather that enough its up to you to cross check. Check more info the SPCR Scythe Mugen 4 CPU Cooler: Scythe Strikes Back
, you can find a lot of info there, including the fan ran on asus mobo on both pwm and voltage controlled. Its fairly good for $50, probably one of the most recommended lately here in SPCR.
If you want to spend more, there are other option, look into Prolimatech Megahalems
, was reviewed some time ago by SPCR, Prolima Megahalems: A Mega Nehalem Cooler
, it should be slightly less wide than the HR22/HR02, 130mm on the Mega vs 140mm on HR02 (the hr22 is the same for practical purposes as its wider but asymmetrical ends up with the same from center to the first PCIe). Its expensive, and doesnt come with fans, it should mount any 120mm standard fan, prolimatech also sells the 140mm vortex slim
that suppose to be very good, they are pwm and drop to around 460rpms on idle and around 1200 on full load, you could even run a pull push as the cooler doesnt go as deep to the back of the case, if you do want to use those fans, you should consider buying also the clips to mount them
, here is a screenshot of FanXpert2 that i ran some months ago,
Another alternative on a less wide cooler is Noctua NH-U12S
, this will end up cheaper as it comes with a fan already, was also reviewed by SPCR, Noctua NH-U12S Slim Tower Heatsink
, you can find others like thermalright spirit 120 or the Macho 120, etc.