Using UDIMM & RDIMM RAM in the same computer

Hello!

I am a video-editor - I have a Dell T3600 Precision Workstation. I've always liked this computer; however, I have recently been getting the error message 'low on memory' when rendering large files. So I thought I'd look into purchasing some more memory for my computer.

My computer has the capac ity to hold 64 GB of RAM memory. Currently, I only have 8GB of UDIMM memory (my receipt said I have 8GB, DDR3 UDIMM Memory, 1600MHz, Non-ECC). However, Dell will only let me upgrade my computer with RDIMM Ram (they were trying to sell me 8 GB Certified Replacement Memory Module, 2Rx4 RDIMM 1333MHz LV). According to the Dell customer service agent, there would be NO conflict if I upgraded my workstation to RDIMM RAM (meaning I could have UDIMM RAM as well as RDIMM Ram in my computer at the same time without any conflict). However, is this really true? Would it harm my computer at all? Or would it even make it any faster?

Any help you guys could provide would be much appreciated!

Thanks so much!