Second hand Mac Pro or new iMac?

Hi there,
Currently have a 2009 27" iMac (core i7 and 16Gb of RAM) with a 500Gb SSD. The computer is starting to show signs of age- the optical drive has packed it in, one of the RAM slots no longer works, I think there are some issues with the logic board (according to my Apple service centre) and the cooling fan now revs at 100% all the time

Anyway, I am thinking of getting a new computer. However I am a little undecided and looking for some advice. I don't do any super heavy duty work on my computer but looking to future proof the computer to get more years out of it. I mainly do work on large stitched photos on Photoshop, some 1080p basic video editing and a little bit of gaming

I am thinking of getting a new 27" iMac (core i5) or a second hand 2010 Mac Pro (hex-core)

If I look at Benchmark scores:

My current computer:

iMac "Core i7" 2.8 27-Inch (Late 2009) 2.8 GHz Core i7 (I7-860)

Geekbench 2
(32-Bit All Cores):
8335Geekbench 2
(64-Bit All Cores):
9717
Geekbench 3
(32-Bit One Core):
2070Geekbench 3
(32-Bit All Cores):
7243
Geekbench 3
(64-Bit One Core):
2273Geekbench 3
(64-Bit All Cores):
8167

iMac "Core i5" 3.2 27-Inch (5K, Late 2015) 3.2 GHz Core i5 (I5-6500)

Geekbench 2
(32-Bit All Cores):
PendingGeekbench 2
(64-Bit All Cores):
Pending
Geekbench 3
(32-Bit One Core):
3552Geekbench 3
(32-Bit All Cores):
10953
Geekbench 3
(64-Bit One Core):
3479Geekbench 3
(64-Bit All Cores):
11696

Mac Pro "Six Core" 3.33 (2010/Westmere) 3.33 GHz 6 Core Xeon W3680

Geekbench 2
(32-Bit All Cores):
14089Geekbench 2
(64-Bit All Cores):
15802
Geekbench 3
(32-Bit One Core):
2526Geekbench 3
(32-Bit All Cores):
13969
Geekbench 3
(64-Bit One Core):
2745Geekbench 3
(64-Bit All Cores):
15541

Being computer literate but not being 'full on', do the above numbers mean the 6 year old Mac Pro about 25% faster than the new iMac? And the new iMac is 30% faster than my old iMac? Will a second hand Mac Pro give me greater longevity over a new iMac or vice-versa? What do these numbers mean to me in the 'real world'? The MacPro is cheaper than a new iMac, that's why I'm leaning that way... Thinking of using my current iMac in target mode as a monitor for the MacPro if I go that way.
Keen to hear your thoughts...
Thanks

Mick

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It depends on your attitude to risk.

With a new iMac+AppleCare you know you will have a machine that will be in good working order for a minimum of three years. With a 6-year-old Mac Pro you will have a machine that could fail and need repairing within a day. Buying individual second-hand machines of that age is a lottery. (It's much less of an issue If you are buying half-a-dozen, and hence can cannibalise them for parts.)

Your best source of information about the relative performance of the models you are comparing for Photoshop will be one of the Photoshop forums. You should also be careful about your 'gaming' requirements. As I understand it, the type of GPU in your Mac Pro is relatively unsuited to gaming applications, it was chosen to boost the performance with 'Pro' applications.

You should also bear in mind you are buying a computer not marrying it and having its children. If it doesn't perform as you want Apple will refund you for the new one within 14 days (check terms at time and place of purchase). For the S/H MacPro you can just resell it.

Also check the "Refurbished" section of the Apple Store online. If you're willing to wait a week or two until what you want comes up you can sometimes pick up a virtually new iMac at a worthwhile discount.

Good luck

C.

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