Should I upgrade Windows 10 32bit to 64bit on older Pentium D 2.8?

I'm using a Dell Optiplex 745 with a 2.8 GHZ Intel Pentium D 820 processor. I I have 32 bit Windows 10 installed, but the processor is 64 bit. It does what I need it to do--mostly word processing and browsing the internet, but Windows processes often use up most of the available ram--2.99G. A motherboard analysis program told me it could use up to 8G of ram. I bought the ram (4 2G sticks) and installed it, but I'm still getting only 2.99G--apparently because it won't use all the ram unless it's running 64 bit. I'm looking into reinstalling Windows 10 64bit to allow the use of all the ram, but I'm not sure if that's worthwhile. The hard drive has MBR partitioning instead of GPT, so it looks like I'd need to reformat that. Anyone have any experience with this?
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More about upgrade windows 32bit 64bit older pentium
  1. Installing 64 bit windows will use the full potential of your CPU. If you use windows 10, make sure you convert the partition to GPT. You can use Partition Magic or a similar software to convert without losing data. It's worth switching to 64 bit.
  2. From what I've read, I'd have to do a clean install and I'd lose the data on the disc anyway. Or am I missing something there?
  3. Switching to a 64 bit OS will mean reinstalling from scratch.
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