ĐÁNH GIÁ ASUS GTX 650

We have two new graphics cards in the lab today: Nvidia"s GeForce GTX 650 & 660, filling the gap between its GeForce GT 640 and GTX 660 Ti with Kepler derivatives. Are these GK107- and GK106-based boards able khổng lồ challenge the Radeon HD 7750 & 7850?

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GeForce GTX 650: Filling In The Gaps

Nearly six months have passed since Nvidia launched its Kepler architecture with the GeForce GTX 680, a thẻ that we praised for its much-improved efficiency & raw performance. Since then, we"ve seen the company replace Fermi-based models with the GeForce GTX 690, 670, 660 Ti, và the GT 640, all leveraging the same technology.

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AMD, which had already launched several of its own current-gen cards when Nvidia struck back, is fighting off the competition with performance-enhancing driver updates, deep price cuts, và BIOS-based overclocking of existing models. What was previously a stable graphics card market is now an all-out battleground, pockmarked with old price tags and new, more attractive deals. Of course, patient enthusiasts have to lớn be loving it, while the gamers who jumped early continue to enjoy their high-end hardware.

In the more mainstream space, AMD"s $110 Radeon HD 7750 & $210 Radeon HD 7850 are dominant, though. Nvidia is finally ready to throw some Kepler-based competition up against those quick & quiet budget-oriented boards. Today, we"re being introduced lớn the GeForce GTX 650 at $109 & the GeForce GTX 660, expected to lớn sell for $229.

Meet GeForce GTX 650

If this block diagram looks familiar, you probably saw it in Nvidia GeForce GT 640 Review: Cramming Kepler Into GK107. GeForce GTX 650 uses the same GK107 graphics processor as the existing GeForce GT 640. It sports two SMX clusters with a total 384 CUDA cores & 32 texture units, và it"s capable of producing 16 full-color pixels per clock cycle thanks to lớn two ROP clusters.

The GeForce GTX 650 has two distinct advantages over the GT 640: higher clock rates and GDDR5 memory. The GTX 650"s 1058 MHz core clock is 158 MHz higher than the GT 640, but this is a relatively minor boost. The real performance boost comes from the GDDR5, which offers two times the bandwidth per clock cycle than DDR3. This improvement is key khổng lồ the GeForce GTX 650"s potential khổng lồ compete with AMD"s Radeon HD 7750.

Let"s have a closer look at this thẻ as it compares khổng lồ the playing field:

GeForce GT 640GeForce GTX 650Radeon HD 7750GeForce GTX 550 TiGeForce GTS 450Shader CoresTexture UnitsColor ROPsFabrication processCore (Shader) ClockMemory ClockMemory BusMemory BandwidthGraphics RAMPower ConnectorsMaximum Thermal thiết kế PowerPrice

384	384	512	192	192
32	32	32	32	32
16	16	16	16	16
28 nm	28 nm	28 nm	40 nm	40 nm
900 MHz	1058 MHz	800 MHz	900 (1800) MHz	783 (1566) MHz
891 MHz DDR3	1250 MHz GDDR5	1125 MHz GDDR5	1025 MHz GDDR5	902 MHz GDDR5
128-bit	128-bit	128-bit	192-bit	128-bit
28.5 GB/s	80 GB/s	72 GB/s	98.5 GB/s	57.7 GB/s
1 GB DDR3	1/2 GB GDDR5	1 GB GDDR5	1/2 GB GDDR5	1/2 GB DDR3
None	1 x 6-pin	None	1 x 6-pin	1 x 6-pin
65 W	64 W	55 W	116 W	106 W
$95-$110 (Newegg)	~$109 (MSRP)	$100-$140 (Newegg)	$110-$150 (Newegg)	$100-$110 (Newegg)

The GeForce GTX 650"s memory bandwidth advantage over the GT 640 is huge. It also appears superior to lớn the GeForce GTS 450 in almost every way, & should compete readily against the Radeon HD 7750 và GeForce GTX 550 Ti.

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Originally, we expected the GeForce GT 640 lớn fall under $100. And at $110, the GeForce GTX 650 will almost assuredly push the lower-end board down to lớn where it should have been at launch.

Gigabyte GeForce GTX 650 Overclock (GV-N650OC-2GI)

Gigabyte"s GeForce GTX 650 is expected khổng lồ sell for $140, which is $30 more than Nvidia"s suggested price, and likely a result of the card"s 2 GB of GDDR5. Less expensive models will include one gigabyte. A 1111 MHz chip core clock is 53 MHz above the reference specification, but the board"s memory operates at the same 1250 MHz.

The GeForce GTX 650 does not feature GPU Boost, so any overclocking that happens beyond 1111 MHz is going to have to be manually-triggered.

Although the reference GeForce GTX 650 has two dual-link DVI ports & one mini-HDMI output, Gigabyte adds an analog đồ họa connection. All told, the card supports four screens operating concurrently: three in Surround mode and one extended desktop.

The card’s PCB is the same 5.5" long as the Afox GeForce GT 640 we"ve already reviews. But the GeForce GTX 650 stands a full 4.5"-tall, rather than occupying a half-height size factor. It requires a six-pin auxiliary nguồn connector, which is somewhat surprising in light of Nvidia"s claimed 64 W thermal ceiling. No SLI connector is available, so multi-card operation is not possible.

Gigabyte covers its GeForce GTX 650 with a large heat sink và a 100 mm tín đồ that performs excellently in our noise & thermal testing. The plastic shroud around the cooler extends past the PCB, making the thẻ look larger than it is.