First off, wether or not you have a E6600 or Q6600 (your sig does not say), you are not bottlenecked enough to warrant an OC based on the rest of your specs. A second GT in SLI might start putting a good demand on on your CPU and you would get more of a benefit from it. There are a few current games that are so CPU centered that an OC would help, but most are GPU centered.
Second, Dell selss ATX, BTX, and their own proprietary mobo's. Are you sure that yours is a BTX and not one of their proprietary boards? While there are still a few BTX boards out there, your pretty limited on good OC'ing with them. They are more about stable, cost effective upgrades for those still using the BTX standard. Most are just older boards with a BIOS revision and most of those baords were designed before the Croe 2 hit it's stride so the tend not to offer up the best N.Bridge for OC's on those chips.
As far as moving over to ATX, well you might face a different issue. If you are running a proprietary or BTX based case, then you will ahve one of Dell's proprietary PSU's as well. It simply wont fit a new case (the exaust will be blocked by a good bit), and there may be power limitations. Many of Dell's proprietary PSU's have enough to run a preconfigured system with a bit extra for some upgrades. Which is fine on the mobo in that system. This often turns out to be a limited PSU once connected to a standard ATX board though. Many of them dont have the two 4 pin or single 8 pin CPU power plug(s) (not to be confused with the 8 pin PCI-e plug), which a standard ATX mobo would require. Dell sometimes runs the extra power needed for the CPU off the extra 4 pins from the 24pin main plug and reduces the power need on the rest of the board. This leads to all sorts of problems when you try to salvage the PSU and case for a rebuild. More often then not, one has to upgrade the PSU as well as the case when rebuilding a dell.
Now non of this is to say that Dell is bad (though many here will assume otherwise). They offer a good product at a reasonable price for the average consumer and above average support/service. Gamers are not the average consumer though. We make up a small portion of the PC market (of course I mean more hardcore gamers like one would find here at GS). Dell does offer fair deals on their game rigs when you consider their warranty, and support service. Their game systems (mainly the XPS modles) tend to allow OC'ing and are ATX based. If you dont want to build yourself, then they are a fair deal.
In your situation, I can only assume that you do not have an XPS rig (dimension maybe). If thats the case, then I would highly suggest sitting tight for a while. E/Q (dual or quad version) 6600 and 8800GT will run almost all games maxed at 1600x1200/1680x1050 or lower for the next year. With nehalem prices already listed right there at the current Core 2 level, then a replacement system a year from now would show a great improvement within a modest price. In other words, trying to invest a couple of hundred (for just a good BTX mobo if you can find one) just to try and squeeze an extra 5 to 50 % out of a CPU that is just fine for most games is far from the best value for your money, let alone the time spent for your OS rebuild.
Again, the only way your CPU will bottleneck in games is if you start installing a 4870 or 9800GTX/GTX200 (this would include the higher end 8800's like the GTX and Ultra as well) series or better GPU. If your system feels really slugish, then consider a fresh install of the OS by hand and not a system restore. Colelct all the drivesr for all your hardware, boot from OS install media and format the main HDD. Install the OS and drivers. Patch up and start installing games. You might see a large performance increase, across the board by doing this. If it still seems slugish then might just have to upgrade. But a system with an E/Q6600, 2GB ram and 8800GT should be pretty snappy and run as a good game platform for some time to come. Good luck on what ever you decide.
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