Graphics Cards Guide
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Looking For The Knockout
Looking For The Knockout
NVIDIA is looking strong right now in the battle for graphics card dominance with its 28nm Kepler architecture seeming to have gotten the best of AMD’s 28nm GCN architecture. Leading the charge is NVIDIA’s GeForce GTX 680, which has put AMD’s flagship Radeon HD 7970 on the ropes. Now, NVIDIA is hoping to land a knockout blow with the dual-GPU GeForce GTX 690, a card NVIDIA is calling the "most powerful and striking video card ever built, with the performance of two GTX 680s running in SLI configuration."
Featuring two Kepler GPU cores running at a base clock speed of 915MHz, with 6008MHz DDR memory, 3072 CUDA cores, and backed up by a massive 4GB of GDDR5 VRAM, the GTX 690 certainly looks impressive on paper.
NVIDIA claims that the GTX 690 will be able to produce scores similar to two GTX 680s running in SLI configuration. We were somewhat skeptical to this claim, as our experience with NVIDIA’s previous generation dual-core GPU, the GTX 590, showed it to be more in line with two GTX 570 cards in SLI rather than dual GTX 580 cards. However, NVIDIA claims that power draw on a single board was the largest gating factor with their previous dual-GPU cards, which resulted in clock speeds on the GTX 590 being dramatically lowered to compensate - something they claim they have since fixed. Kepler’s superior power efficiency does seem to support this claim, although, in comparing the GTX 690 with the GTX 680, we did notice that the GTX 680 does have a slightly higher core clock speed of 1006MHz vs. 915MHz on the GTX 690. At least apart from a small difference in clock speeds, the GPUs used are the same as those on the GTX 680, thus delivering the full firepower of the architecture.
In further attempts to minimize power use on the GTX 690, NVIDIA is employing a 10-phase power supply with a 10-layer copper circuit board to ensure efficiency. The card is powered by two 8-pin Molex connectors. The GTX 690 has a rated TDP of 300W, which would necessitate a 650 or 700W PSU at the very least.
NVIDIA hasn’t just built the GTX 690 for performance, they’ve also worked on the overall build with extra concern for the heat and noise aspects of the card. The card takes up two slots and is just under 300mm in length (just about 11 inches). It's built with a rugged, industrial-looking, cast aluminum shroud, with trivalent chromium plating for extra protection.
Like the GTX 590, the GTX 690 features a centrally located fan sitting between two GPUs, each with their own array of nickel-plated cooling fins. Cool air is sucked in through the fans and onto the fins, while hot air is vented out at backplate, sides and even the rear of the card. Heat output and management could be a problem, but more on that during our temperature testing section.
The fan housing itself is manufactured from magnesium alloy using a thixomolding process in which liquid magnesium alloy is injected into a mold. NVIDIA uses the same aluminum used by Lockheed Martin on the F-22 Raptor fighter jet for its light weight, good heat dissipation and acoustic dampening properties.
NVIDIA has gone for a three dual-link DVI setup, similar to the GTX 590. Surprisingly, they've opted for a Mini-DisplayPort as the fourth port, omitting the mini-HDMI port this time round. The GTX 690 is of course capable of driving up to four monitors simultaneously, three in 3D Vision Surround, and a fourth without 3D. The limitation is purely a software constraint as put forth by NVIDIA as they find that gamers don't really need to go beyond triple screens for immersive gameplay, nor is it practical.
At an astronomical launch price of USD$999, the GTX 690 will be desired by only the most hardcore of enthusiasts. Given the price of a single GTX 680, the asking price of the GTX 690 with its capabilities and configuration doesn't really sound anything amiss. You either buy two separate cards or you get a single GTX 690. The choice is pretty clear. For those who really can splurge, you can even choose to purchase dual GTX 690 cards for the ultimate SLI setup. However take note that availability will be in very limited quantities, with a rumored 1000 units produced worldwide. Expect local supply to be even more limited, with the possibility of as few as 20 units reaching our shores.
So let's get on with how it really performs, starting with a specs comparison listing to quickly capture the vital stats of all the competitive graphics cards:-
|Model||NVIDIA GeForce GTX 690||NVIDIA GeForce GTX 680||AMD Radeon HD 7970||NVIDIA GeForce GTX 590||AMD Radeon HD 6990|
|Core Code||Dual GK104||GK104||Tahiti XT||GF110||Antilles|
|Transistor Count||7080 million||3540 million||4300 million||6000 million||5280 million|
|Core Clock||915MHz||1006MHz||925MHz||607MHz||830 / 880MHz|
|Stream Processors||3072 Stream processing units||1536 Stream processing units||2048 Stream processing units||1024 Stream processing units||3072 Stream processing units|
|Stream Processor Clock||915MHz||1006MHz||925MHz||607MHz||830 / 880MHz|
|Texture Mapping Units (TMU) or Texture Filtering (TF) units||256||128||112||128||192|
|Raster Operator units (ROP)||64||32||32||96||64|
|Memory Clock||6008MHz GDDR5||6008MHz GDDR5||5500MHz GDDR5||3414MHz GDDR5||5000MHz GDDR5|
|DDR Memory Bus||256-bit x 2||256-bit||384-bit||384-bit x 2||512-bit|
|Memory Bandwidth||384.4 GB/s||192.3GB/s||264GB/s||327.7GB/s||320GB/s|
|PCI Express Interface||PCIe ver 3.0 x16||PCIe ver 3.0 x16||PCIe ver 3.0 x16||PCIe ver 2.0 x16||PCIe ver 2.0 x16|
|Molex Power Connectors||2 x 8-pin||2 x 6-pin||1 x 6-pin, 1 x 8-pin||2 x 8-pin||2 x 8-pin|
|Multi GPU Technology||SLI||SLI||CrossFireX||SLI||CrossFireX|
|DVI Output Support||3 x Dual-Link||2 x Dual-Link||2 x Dual-Link||3 x Dual-Link||1 x Dual-Link|
(version 1.2 HBR2)
(version 1.2 HBR2)
|HDCP Output Support||Yes||Yes||Yes||Yes||Yes|
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