Thumb Twiddling
I'm sitting here watching WorldBench run (not for long mind you) and I thought I'd relay some of the interesting discoveries from the memory configuration process.
First and foremost, when you buy a memory "kit", say a 4GB 1600MHz kit, that's all that's guaranteed to work in your system. You can't just buy another 4GB kit and know the 8GB will work under all conditions. It may, but there's no vendor guarantee. This is really only an issue on the bleeding edge, but it's worth noting that there are no 8GB kits. I'm going to have some long talks with memory vendors after the dust has cleared and I'll be able to offer more particulars. All I can say to you system builders out there is that both "Bleeding Edge" and "Beta" start with a "B".
Our preliminary test run at 3.66GHz with 4GB of 1600MHz memory garnered a 133 WorldBench score. That's about 3 points shy of the record I believe, but there's a lot of headroom here. Currently we're running the same config but with 8GB. Worldbench kept hanging with the memory voltage at only 1.8 and the northbridge at 1.3 so I bumped those up to 2.0 and 1.45 respectively. These are the highest "safe" settings in the EVGA 790i Ultra Sli's BIOS. nVidia has done a nice job in that regard. "Safe" voltages are in green, greater voltages that might be dicey are in red. Nice touch. The 790i SLI Ultra also has lots of pre-configured overclocking settings so it's very friendly in that regard.
Later...
I managed to finish one run of the 8GB and the score was 135. Unfortunately, the Firefox 2 and Firefox/Windows Media Encoder multitasking portions didn't complete during the 2nd and third passes so that's not official. The Test Center's William Wang will be back on Monday to continue official testing. I'm going to switch to the Crucial Ballistix 2000MHz and run it overnight and see what I find in the morning.
Even Later...
With 4GB, the Crucial 2000MHz wasn't stable in the least, freezing, and failing the Vista memory diagnostic. At 1600MHz it seems to be fine. We may not be able to go 200MHz with 4GB. Drat. Before I left, I cranked the QX9650 up to 4GHz (upped the voltage to 1.45) and left it running with the Crucial at 1600MHz, hopefully it will be fine and have completed three runs when I return. I didn't have to increase the CPU voltage at all for 3.66GHz.
While high WorldBench numbers are nice, speed was not the sole criteria for this machine. It was meant to be well-rounded PC equally equally suited to a number of different tasks. We'll probably break the record, but I expect a number of machines to eclipse the mark in the near future with the latest hardware.
Skulltrail IS Fast
I said it once before about the D5400XS that I had to forsake. It was FAST. It didn't show up in our tests, but subjectively I have never, ever seen Windows behave that snappily. I initially attributed that to the SSDs, but it was really the D5400XS. That said, there were reasons behind the decision to ditch it that readers have asked about. Subsequently, I found out that the eSATA not working was probably more the fault of the Adaptec 3405's BIOS, but that revelation wasn't enough to bring the Skulltrail back.
The reasons the D5400XS left the build were as follows.
1. Blocked slots. I couldn't use the E-MU 1616m sound card because the SLI graphics cards blocked the PCI slots.
2. Thermals. The 800MHz FB DDR2 memory ran very hot. The CPUs gave off a lot of heat, and cooling two CPUs was going to mean coolant tubing running all over the place. Also, the stock plumping wasn't designed with 2 CPUs in mind. Then there were the two 9800 GX2 which blow a lot a heat as well.
3. The long boot time was driving me crazy. 30-45 seconds before the LCD even lights up to show you the unit is working is too long for a consumer machine. Intel needs to dump the server boot diagnostics or at least provide an option to bypass them. Check the VGA first and at least let us know what's going on guys.
4. CPU availability. In the long run, I wasn't sure that Intel would continue to provide unlocked LGA771 CPUs. At least in a timely fashion. They may, but they're very expensive and I know they'll continue to provide enthusiast LGA775 CPUs for as long as the socket is sold.
In the end, I made a judgment call and decided that the majority of users would be happier with something a bit more mainstream that boots faster and that they'll be able to drop a new processor into. And the sound card... I hope the winner is musical.
By the way, thanks again to Daniel Snyder and the D5400XS team for the help they provided. Maybe next time.
Cheers, Jon