Re: Cost Justifications

[Evan Harris <auctionitis@xxxxxxxxx>]

What's the heat differential ? And the power requirement for the
cooling equipment to handle it ? :)

As you've pointed out the OP should also consider the maintenance and
license costs if any of keeping an existing machine versus upgrading
as this is often a simpler sell to management as it's a direct cost.

On Wed, Mar 9, 2011 at 9:45 AM, DrFranken <midrange@xxxxxxxxxxxx> wrote:
> Well the 720 and the 250 are about a wash in 'spec power' at 750 amd 782
> watts respectively. That said, what you GET for those watts is a little
> different. The biggest 250 was 75 (Seventy five!) CPW (20 interactive)
> while the teeeeeeniest 720 is nearly 6,000 CPW (one core) and as much as
> 46,300 with all eight cores going.  So a one core 720 is equal to Eighty
> 250s in CPU capability.  IN practice I would expect the 720 to draw far
> less than that and I measured a 2-core system with 6 drives closer to
> 100 Watts with IBM i 7.1 simply idling. (No user work at the time.)
>
> The 720 also comes with a 3 year warranty so you drop maintenance cost.
>
> I also did a comparison of a POWER5 550 to a POWER7 750 and the ratio
> there is 100 to 1 on power per CPW. That is the 750 generates 100 times
> more CPW per input Watt than a 550! That's a lot of savings!
>
>     - Larry