I'm looking for a decently beefier arduino, but from what I can tell by using google the best I can get is up to 80mhz clock speed. I need something closer to or higher than 500 with more ram, I found the Intel Edison but it runs linux, what I'm looking for is something that is bare metal like the arduino. I need the higher clock rate for faster calculations and more ram for storing vertex information for a 3D renderer. Thanks for your help everybody.
Adding to Mikael Patel's answer and noting the comment (from that Dat Ha) that says it only gives 36% of the power. You say it for a project for 3D graphics- 3D graphics with sensible implementations can be parallelised so you could you may use at least three (or more) Teensys to get that 500 Mhz you really want- that assuming the CPU power is mostly used for 3D -as it seems you are saying that. Generally speaking 3D graphics can usually be parallelised and which you would be doing yourself -since you are writing the library. So you could use three Teensy to do the 3d graphics in parallel and the other Teensy to do the other stuff you want.
But 180Mhz is fast enough to at least do a 3D wireframe library -with a few colours and put it on a display screen-there used to be primitive (by todays standards) 3d games on the older generation of computers that ran slower than 180mhz -so its possible.
But what does it have to using something like bare metal?-is that really an essential requirement?. If you give more details about your project I can give a more of an answer.
Personally, I wouldnt use arduino type boards for these types of problems unless there was a good reason to do so and it was a sensible idea to use such boards. To do the type of graphics that you want seem to require something like a standard PC or something near to that-if you use standard PC you can use directx to base you library on if you wanted to-to make your life easier.
I do 3D graphics on a PIC32MZ...EF based chipKIT board (WiFire). It is 200MHz, built in FPU, lots of RAM and Flash, and is Arduino compatible.
Beat that, teensy...