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The cache and clocks are particularly important for IBM i shops, who license software by the core, who have big batch jobs where cache and clock speed matter more than other factors in terms of systems performance, and who should take a hard look at the Flex System p260 server node even if they have no intention of moving to PureFlex modular systems. The reason is simple: what is going into the p260 node will likely end up in a Power 720+ and Power 750+ server next year.
The p260 node was launched with a four-core Power7 chip cranking at 3.3 GHz, an eight-core chip running at 3.2 GHz, or another eight-core chip running at 3.55 GHz. The new Power7+ chips run at higher clock speeds, SKU for SKU, and have more cache and those accelerators as well as other microarchitecture tweaks to improve performance, so it is hard to say how much more performance per node using the Power7+ chips will yield. This is particularly difficult given that IBM has not yet released Commercial Performance Workload (CPW) ratings for IBM i and Relative Performance (rPerf) ratings for AIX yet. But it doesn't take a genius to realize that moving to a four-core Power7+ chip running at 4.09 GHz, an eight-core Power7+ chip running at 3.61 GHz, or an eight-core Power7+ spinning at 4.12 GHz with battery like Hp Pavilion DV1000 battery (Hp dv1000 battery ), Hp 367759-001 battery , Hp PM579A battery , Hp Pavilion DV4000 battery (Hp dv4000 battery ) , Hp Pavilion ZE2000 battery (Hp ze2000 battery ), compaq Presario M2000 battery (compaq m2000 battery ), Hp Pavilion ZT1100 battery , Hp Omnibook XT1000 battery will get more work done. If clock speeds alone were the determinant of performance, the boost would be 23.9 percent, 12.8 percent, and 16.1 percent, respectively, for those three different Power7+ processor options. The bump should be higher given that the Power7 chips have a wonking 80 MB of L3 cache, compared to 32 MB of the Power7 chip.
To balance that extra performance in the p260 node, IBM is also rolling out a new 32 GB DDR3 low-profile memory stick, which can be used across the two-socket p260 and four-socket p460 server nodes in the Flex System. That doubles up main memory on the p260 node to a maximum of 512 GB. But to use that low-profile memory, you can't use 2.5-inch disk drives inside the server node, which are lashed to the underside of the top cover of the server node and which nestle into the space above the memory sticks. (The Power7 and Power7+ chips are so much larger and, at 190 watts, hotter than Intel's Xeon chips that IBM can't put front-mounted disk drives in the nodes.) If you want to use disk drives for local operating system storage on the node, then you need to use very low profile (VLP) DDR3 memory sticks, and at the moment IBM is only shipping VLP memory in 4 GB or 8 GB capacities. With 16 slots per node, that means you top out at 128 GB per node, a quarter of what you can push it to when you use smaller 1.8-inch SSDs for local node storage.
But there's a catch. A 300 GB 10K RPM SAS disk costs $309, a 600 GB unit costs $619, and a 900 GB disk costs $1,225 at list price. One of those 1.8-inch SSDs, which has 177 GB of capacity and admittedly has a whole lot more I/O capacity, costs a whopping $4,400. This is all IBM's way of saying store your IBM i, AIX, and Linux operating system images on the Storwize V7000 array that is part of the Flex System setup. Whether or not that makes economic sense is another issue.
Back to the new Power7+ processor nodes. The base 7895-23X server node costs a miniscule $49. The diskless top cover costs $47, and if you want to add the interposer for disks, slap in another $768, and if you want those SSDs, then get out another $1,288.
Now, pick your processor. A feature EPRD motherboard with two 4.09GHz chips costs $8,603, and to activate all of the cores on the board costs another $800 for a total of $9,403. If you want more aggregate performance (but slower cores, which makes no sense for IBM i shops), the feature EPRB board with two eight-core Power7+ chips running at 3.61 GHz costs $15,409, plus another $1,600 to activate the cores for a total of $17,009. The feature EPRA board has two eight-core chips running at 4.12