Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Does it have the slide in mounts for all four drive bays?
Document: This won't be an issue usually unless you run applications that saturate the memory bus.The Mac Pro has three available drive bays that are extremely easy to add drives into. It's a matter of just positioning the drive sled on the bottom of the SATA drive and attaching the four captive screws. There's a nice rubber washer there to help reduce vibration and transmitted noise. A very nice touch. There are no cables between the drive and motherboard.
I have to say this Mac Pro is very nice and speedy but there are some CONS to go with the PROS.Pros:1. Very fast. 4x faster at video encoding and CS4 with multiple hard drives installed and 8GB of ram compared to iMac line2. 5 Hard drive bays with RAID support3. up to 8GB of ram4. Energy efficientCONS:1. GT120 video card is a joke, doesn't work with HDMI sources (with dvi to hdmi cable) and poor windows support in boot camp.2.
Conclusion: if you use your computer for serious work and can't afford to fight your computer, the additional cost, if any, is certainly worth it.Is it perfect? No. I wish it came with more USB ports and a multi-card reader and an illuminated keyboard. (All are available as accessories.) I also wish it had six memory slots (it has four. )Bottom line: I love this computer and I can't imagine ever buying another Windows machine.
Bought this computer to replace my Dell Precision 330 engineering workstation. The hard drive had gone out and I had replaced with Linux which had been running for over ten years. Got used to the command line so I bought an Apple power book to play with BSD Linux under the terminal.
I frequently have InDesign, Illustrator, Photoshop, MS Entourage, Word, iTunes and a web browser running at all times, and I've yet to notice one slowdown. It's at least a four to six fold increase in speed... at least. I did a couple of tests before deactivating all the software from the old box. InDesign CS4 catalogs that would take 1:38 to export to a high quality pdf now take around 23 seconds.
I was so excited to buy my first real Mac and anxiously awaited the arrival of my "baby." Right out of the box it was the fastest computer I have ever owned. I added another drive in about 5 minutes, and most of that was reading and re-reading the instructions! The OS is great and i love how easy the graphical interface is.
First, the front case fan has an annoying intermittent vibration that comes and goes. Second, the DVD drive sounds like it is going to explode when it spins up. Plus, the DVD disk carriage is the flimsiest plastic I have ever encountered in a drive. It feels like it will crack if I bump it.
Hence, I just bought an extra video card. The case is a breeze to work with. I slipped in the video card without any screwdriver or tools. My old hard drive went into the second slot tray (I did need a screwdriver to fasten the hard drive to the tray). The hard drive trays are side by side and pull out like a drawer. No wires, no broken fingernails, no bloody knuckles. RAM can be added and swapped out easily too.
I knew that the Mac Pro had enough horsepower to virtualize them while still having an acceptable everyday experience.This thing is a workhorse!!! I allocated only 2GB of memory to run Windows 7 under VMWare Fusion and it handles all of what I wanted easily with 4GB left under the hood.The only thing I wished I would have upgraded to a 1TB hard drive but I bought off amazon because it was the cheapest source. Apple was going to charge me for the hard drive.
The G5 was loud and hot. The ATI x800 XT was a noisy and a buggy video card. When I opened my new Mac Pro I was wondering if I should have bought last year's dual quad processor  (2.8 Ghz) instead of the new Nehalem single processor (2.6 Ghz). The prices were pretty close. The 2009 model has more RAM and a bigger hard drive. Rest assured this new machine is no slouch.
Answer: Hi John - yes. All drive caddies are present. I would likely put 1TB (or 2TB if I have any spare) drives (wiped clean) on each one. Pete