An expensive beast.

For an index of all my Mac Pro articles, click here.

The 2013 Mac Pro may still be hard to find but that does not mean the buyer should overpay for the better CPUs available. Paying Apple or OWC a huge premium for a better CPU suggests you have more money than sense, in which case go for it. This piece is not for you.

The nMP adds one feature not available in the oMP – Thunderbolt. This Intel data communication technology is a motherboard-only hardware installation and it is extremely unlikely that the aftermarket will ever see a TB-equipped motherboard for the oMP. So that means data speeds are limited to 600mb/s at best in the oMP (using a PCIe SATAIII card) whereas twice that rate should be theoretically possible in the nMP.

Where the nMP falls down in price:performance is in CPU speeds. The Geekbench chart below is for multi-core performance.

64-bit multi-core Geekbench data.

Given that the oMP can be upgraded with even faster CPUs than the fastest Apple ever marketed, the 4-core base nMP’s CPU performance is poor by comparison. Install a couple of X5680 3.33GHz or X5690 3.46GHz Xeons in your 2009-2012 oMP and you will get Geekbench scores of 30-32,000, which equals the extremely costly $7,000 top of the line nMP for half the total cost of the computer.

The stock 4-core Xeon E5-1620 in the nMP Geekbenches at 14,600. There are currently three ways of getting a faster CPU:

• Pay lots to Apple for a costlier CPU at purchase of your nMP
• Pay lots to OWC/MacSales when you send in your nMP for upgrade and they resell your old CPU for which you get zilch. You have to ship the complete nMP to OWC for the upgrade.
• Do it yourself and save lots of money

Here’s the current data for the available CPU options which are known to work:

All of these CPUs have a Thermal Design Power of 130 watts, which compares to 80 watts (E5520 8-core), 95 watts (X5650, X5660, X5670, X5675 – all 12 core) and 130 watts (W5590 (8-core), X5680 (12), X5690 (12)) for 2009-2012 dual CPU oMPs.

To ensure meaningful comparisons, I have shown all the Apple-bought options with twin D500 GPUs, 16GB of RAM (the $3,000 base spec nMP comes with only 12GB), and a 256GB SSD. So, as you can see, Apple is charging a premium of $3,500 to upgrade from the 4-core to the 12-core CPU. OWC is barely better, charging $2,978 for the upgrade.

The math could scarcely be simpler. First, there is no earthly reason to buy a new Intel CPU. Used CPUs pulled from servers are fine – I lose count of how many of these I have installed in oMPs and have never had one fail. Never. Just avoid Engineering Samples – look for the ‘S-spec’ on the CPU lid, which confirms that it’s the final item.

Model number and ‘S-spec’ on a final production CPU.

Do the CPU upgrade yourself:

You can do the nMP CPU upgrade yourself. There’s a fair number of sub-assemblies to remove to get at the single CPU which is buried deep inside the form-over-function cylindrical case design of the nMP, but patience and care will get you there. Until Apple Service Manuals become available, the iFixit guide is excellent:

Click the image for the iFixit CPU replacement guide.

Economics of the DIY upgrade:

The current data suggest the following is the most cost effective approach:

• Purchase the base 4-core nMP new with 16GB of RAM – $3,500
• Purchase a used 12-core E5-2697 on eBay for $2,500 (Must be marked ‘SR19H’; avoid ones marked ‘QDUF’ which are beta test engineering samples)
• Sell the stock E5-1620 for $150
• Net cost of the 12-core upgraded nMP: $5,850. That’s $1,150 less than Apple charges.

The warranty issue:

This piece by OWC says the warranty remains valid when you do a CPU upgrade, unless you damage the machine in the process. Beats me if it’s right as I have not read of the principle being tested, so do your own research if a warranty is important to you:

OWC on warranties.

I remain unconcerned as CPUs very rarely fail. Fans, graphics cards, disk drives, even memory sticks – all of these are likely to fail far sooner than a CPU. That’s where you will most likely claim under warranty.

Other upgradables:

1 – RAM:

Memory upgrades are already available from OWC. Other suppliers will doubtless follow. Four 16GB 1866MHz sticks will cost you $850 or so at OWC, replacing the four 4GB sticks in the stock machine. Alternatively, go to B&H and pay $225 less for Crucial RAM of like spec. Replacement is a trivial process – unplug the old, plug in the new and you are done.

2 – Solid State Drives:

Conventional 1TB SSDs from Samsung run some $450, but these will not fit in the nMP. Apple uses a proprietary connector for the internal SSD, which is retained with but one Torx T8 screw – a trivial replacement. Here are the Apple options:

Until aftermarket options become available the best thing here is to simply wait if you really must have a huge SSD. Given that the best use of an SSD is for the OS and applications I am somewhat mystified why anyone needs 1TB, even with large scratch disks. Further, there’s nothing to stop you using an external SSD in your overpriced Thunderbolt enclosure as a super fast boot and apps drive. But paying $800 for a 1TB internal drive makes little sense.