Showing posts with label sli. Show all posts
Showing posts with label sli. Show all posts

Tuesday, July 13, 2010

AVADirect Core 2 Duo SLI Gaming System

Our first thought upon opening AVADirect’s new Core 2 Duo SLI Gaming System was, “Wow, this is heavy.” Our second, “Oooh, but it’s pretty!” was followed shortly by a third, “It’s bleeding!” A cursory inspection revealed that the system was shipped without one of its two CPU-cooler hose clamps, and was indeed leaking AVA’s “bloody red” coolant into the machine. Disconcerting, to say the least. We notified AVADirect of the problem, and they dispatched a tech to fix it. Thereafter, despite some red residue on one of the 8800’s DVI ports, the rig worked perfectly.

Aside from this initial gaffe, the AVADirect impressed us with its build quality. The first thing we saw when we opened the SilverStone Temjin TJ07 case was a sprawl of water-cooling tubes running to both GPUs, the RAM, and the CPU. The aforementioned “bloody red” cooling fluid is augmented by four red cold-cathode tubes along the sides of the acrylic window, lending a fearsome aspect to the rig’s innards. Cables and wires were neatly routed along the inside of the case, but certainly not as neatly as in last month’s HP Blackbird. The modular 1,200W Thermaltake Toughpower PSU provides a ridiculous amount of power while remaining mostly hidden beneath a partition at the bottom of the case.

AVA certainly makes good use of the Temjin’s seven 5.25-inch external drive bays; the first two hold an AlphaCool white-on-blue LCD that displays system stats like drive space, CPU, and RAM utilization, as well as a faux-analog clock. The next bay holds a Pioneer Blu-ray reader/DVD burner combo drive. Two more drive bays contain the Koolance reservoir pumps that drive the liquid-cooling system and display per-reservoir fluid temps, leaving just two bays free.

Does this mess o’ tubes make a difference? Yep! The max idle temperature was 35 C, and during our stress tests no core got above 72 C. Not shabby. And other than our initial leakage issue, the cooling system is very neatly installed, routed, and configured. There are no wasted pipes, and the whole thing looks terribly impressive. Maybe too impressive. While we appreciate the thought, most folks would probably agree that water cooling is overkill for some of the components—we’re looking at you, overclocked RAM.

AVA overclocked this machine to the nines. The Intel Core 2 Extreme QX6850 CPU is running at 3.67GHz, up from 3.0GHz, the dual EVGA e-GeForce 8800 Ultras are “superclocked” to 655MHz, and even the OCZ RAM is ratcheted up to 1150MHz. We tested the rig with our Prime95 stress test, and detected no stability problems.

The overclocking shows, too. Despite shipping with Vista (a questionable choice), the AVADirect blazed through our FEAR benchmark at 184fps, faster than any other rig we’ve tested. Its Quake score was a respectable 205fps­—nearly twice as fast as the Blackbird, and right up there with the fastest XP rigs we’ve seen. What can we say, except that Nvidia’s OpenGL driver, even in Vista, is still better than AMD’s.

Performance was top-notch and easily bested our new quad-core zero-point system (see page 70)­­­—no surprise, as the AVADirect box sings along at clock speeds 1GHz higher. Our point of reference against other rigs is blank, as this is the first machine tested using our new benchmarks. We did, however, run our old Photoshop CS2 script on the AVADirect, and while it’s fast, the rig’s scores were a bit slower than those of the recently reviewed Dell and HP PCs.

The rest of the AVADirect’s hardware is just as high-powered, if not exactly what we expected. The Asus Xonar D2 soundcard sounds great and includes color-coded backlit inputs and plenty of ports, but no hardware processing. This is the first rig we’ve tested in a while that shipped with a dedicated soundcard other than a SoundBlaster X-Fi; most rigs, if they eschew Creative, opt for onboard audio. It’s a relief not to have to listen to RealTek audio.

The 150GB Raptors in RAID 0 are speedy but will leave system owners walking the high-wire without a net since there’s no backup drive. Would a simple terabyte drive have hurt, guys? And why not install XP while you’re at it? The AVADirect box is the first to impress us with its almost XP-like gaming performance, but let’s face it, gaming and Vista are still an odd couple. Another letdown: Where’s the Penryn? When the company said it was shipping us a “next-gen” box, we thought it would include Penryn and Nvidia’s G92, but the machine included a 1,333MHz Kentsfield CPU and GeForce 8800 Ultras. Hardly next-gen.

Despite these quibbles, we were generally impressed with the system’s stability and performance. The horror of a leaky water-cooling system was ameliorated by the quick corrective action taken by AVADirect’s optional on-site tech support.

While we wouldn’t necessarily buy this exact configuration, we’d definitely go to AVADirect for their nigh-infinite customizability, good build quality, and excellent tech support.

Click to Enlarge

Pretty lights abound on the AVADirect Core 2 Duo SLI Gaming System.

Friday, July 9, 2010

CrossFire and SLI Performance Fix for Vista, Part Deux

Back in July, Microsoft rolled out a fix for a nasty bug in its Windows Vista SLI and CrossFire multi-GPU support: Windows Vista was using only one of the GPUs! However, the Inquirer.net website reported yesterday that a more subtle bug is still plaguing some multi-GPU setups: a problem with load-balancing between GPUs.

Load-Balancing Woes and System Slowdowns

If one of the GPUs in your system is very busy, and and other idle GPUs receive a new DMA packet, you may experience scheduling latency. In plain language, your system slows down until all GPUs are assigned work to do. If you like to juggle games and other applications at the same time on your SLI or CrossFire system, you're a prime candidate for this type of slowdown.

Meet LDA, a Way to Avoid Saying "SLI" or "CrossFire"

This update isn't going to show up in Windows Update, at least not for awhile. And, if you ran into it during a casual scan of recent downloads, you might not even recognize it. That's because Microsoft is now referring to multi-GPU configurations as Linked Display Adapter (LDA) setups. SLI and CrossFire fans, make a note of this: every time you see a reference to LDA at Microsoft, think SLI (nVIDIA) or CrossFire (ATI/AMD).

Learning More About the Update...and Getting It

Microsoft has information about the hotfix, available for both 32-bit and 64-bit Windows Vista, at Knowledge Base article 945149. You must request the hotfix from Microsoft, rather than download it directly from the KB article. Microsoft promises a download link within 8 business hours, as we discussed in our article Hotfixes by Email - Just What the Windows Doctor Ordered.

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Help Windows Vista newbies learn how to use BitLocker to stop data theft, get organized with Windows Calendar, and back up data and systems the easy way: give Mark's new book Maximum PC Microsoft Windows Vista Exposed. It's now available at Amazon.com and other fine bookstores.

Thursday, July 8, 2010

CrossFire and SLI Performance Fix for Vista, Part Deux

Back in July, Microsoft rolled out a fix for a nasty bug in its Windows Vista SLI and CrossFire multi-GPU support: Windows Vista was using only one of the GPUs! However, the Inquirer.net website reported yesterday that a more subtle bug is still plaguing some multi-GPU setups: a problem with load-balancing between GPUs.

Load-Balancing Woes and System Slowdowns

If one of the GPUs in your system is very busy, and and other idle GPUs receive a new DMA packet, you may experience scheduling latency. In plain language, your system slows down until all GPUs are assigned work to do. If you like to juggle games and other applications at the same time on your SLI or CrossFire system, you're a prime candidate for this type of slowdown.

Meet LDA, a Way to Avoid Saying "SLI" or "CrossFire"

This update isn't going to show up in Windows Update, at least not for awhile. And, if you ran into it during a casual scan of recent downloads, you might not even recognize it. That's because Microsoft is now referring to multi-GPU configurations as Linked Display Adapter (LDA) setups. SLI and CrossFire fans, make a note of this: every time you see a reference to LDA at Microsoft, think SLI (nVIDIA) or CrossFire (ATI/AMD).

Learning More About the Update...and Getting It

Microsoft has information about the hotfix, available for both 32-bit and 64-bit Windows Vista, at Knowledge Base article 945149. You must request the hotfix from Microsoft, rather than download it directly from the KB article. Microsoft promises a download link within 8 business hours, as we discussed in our article Hotfixes by Email - Just What the Windows Doctor Ordered.

-------------------------------------------------------------------------------

Help Windows Vista newbies learn how to use BitLocker to stop data theft, get organized with Windows Calendar, and back up data and systems the easy way: give Mark's new book Maximum PC Microsoft Windows Vista Exposed. It's now available at Amazon.com and other fine bookstores.


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