In our follow-up, we found that HP's on-line configuration tool does not allow for DDR3-1333 memory so we went to the street for a comparison. For starters, we examined the on-line price from HP with DDR3-1066 memory and the added QLogic QMH2462 Fiber Channel adapter ($750) and additional NC360m dual-port Gigabit Ethernet controller ($320) which came to a grand total of $28,280 for the blade (about $277/VM, not including Blade chassis or SAN storage).
Stripping memory from the build-out results in a $7,970 floor to the hardware, sans memory. Going to the street to find 8GB sticks with DDR3-1333 ratings and HP support yielded the Kingston KTH-PL313K3/24G kit (3x 8GB DIMMs) of which we would need three to complete the build-out. At $4,773 per kit, the completed system comes to $22,289 (about $218/VM, not including chassis or storage) which may do more to demonstrate Kingston's value in the market place rather than HP's penchant for "over-priced" memory.
Now, the interesting disclosure from HP's testing team is this:
[caption id="attachment_1203" align="aligncenter" width="450" caption="Notes from HP's VMmark submission."]
[/caption]While this appears to boost memory performance significantly for HP's latest run (compared to the 24.24@17 tiles score back in May, 2009) it does so at the risk of running the Nehalem-EP memory controller out of specification - essentially, driving the controller beyond the rated load. It is hard for us to imagine that this specific configuration would be vendor supported if used in a problematic customer installation.
SOLORI's Take:Those of you following closely may be asking yourselves: "Why did HP choose to over-clock the memory controller in this run by pushing a 1066MHz, 2DPC limit to 1333MHz?" It would appear the answer is self-evident: the extra 6% was needed to put them over the Lenovo machine. This issue raises a new question about the VMmark validation process: "Should out of specification configurations be allowed in the general benchmark corpus?" It is our opinion that VMmark should represent off-the-shelf, fully-supported configurations only - not esoteric configuration tweaks and questionable over-clocking practices.
Should there be as "unlimited" category in the VMmark arena? Who knows? How many enterprises knowingly commit their mission critical data and processes to systems running over-clocked processors and over-driven memory controllers? No hands? That's what we thought... Congratulations anyway to HP for clawing their way to the top of the VMmark 8-core heap...
1333MHz ram is within spec for the x5570. See http://ark.intel.com/Product.aspx?id=37111
ReplyDeleteThese CPU overclock themselves via "turbo boost", but only if a few of the cores are idle.