You may still be waiting for your Mac Pro to arrive, but OWC is ready to sell you a CPU upgrade once it does. The company offers a choice of four E5 2600-series processors, ranging from an 8-core 2.6GHz chip with 20MB cache for $950, to a 12-core 2.7GHz processor for $1480.

We first confirmed that CPU upgrades were possible last December. The company says the upgraded processors offer speed gains ranging from 25 percent to 46 percent over Apple’s base model 4-core 1600-series processor. You can get rebates of between $100 and $750 for trading in the processor supplied with your Mac Pro, and also have the option of boosting the RAM from Apple’s maximum of 64GB to 128GB … 

The company says all its processors are guaranteed compatible and meet or exceed Apple’s technical specifications and thermal requirements.

If you want to see what’s involved in swapping the processor, we posted a video earlier in the month.