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NVIDIA GeForce GT 640 review roundup: a $99 card that fails to keep Kepler's promise
NVIDIA blew reviewers away with its flagship GTX 680, but building cards for the low-end is a whole different challenge. The GT 640 hits the $99 price point, where it sits right between the AMD Radeon HD 7750 at $109 and the last-gen Radeon 6670 at around $80. As it turns out, these rivals pull off something of a pincer movement, leaving NVIDIA's card little room to retaliate. The GT 640 contains a 28nm Kepler chip, but it's a cutdown version of the silicon with just 384 CUDA cores, a poor memory bandwidth of 28.5GB/s and no GPU Boost feature -- which means the card can't boost its 900MHz to make use of thermal headroom. These limitations have a significant impact on the benchmarks, as you'll see in our little review roundup after the break.
AMD announces 900MHz version of the Radeon HD 7750, calls it 'the other 7750'
The original Radeon HD 7750 won plaudits for its low-wattage performance and $109 price tag, but now AMD's decided to put out an additional version with 100MHz more clock whizz. The new card also happens to be called the Radeon HD 7750, and it'll sit alongside its doppelganger on the shelves of the world's computer stores just daring you spot the difference. How will you do that? By checking if it requires a separate power supply: the original 7750 was powered entirely through the PCIe slot, limiting its power to 75W and hence its clock speed to 800MHz, while the new one accepts additional power to deliver slightly more grunt and stay ahead of looming competition from NVIDIA. XFX has already jumped aboard with the 7750 Black Edition Double Dissipation priced at $115 after a rebate, and AnandTech says other vendors will follow suit. So, unless you're totally out of power jacks, you know what to look for. Image courtesy of Newegg.
AMD releases Radeon HD 7750 and 7770 GPUs, reviewers like and don't like
Not into that whole $500 fuse-melting monster graphics card thing? Then good news for you: AMD has finally brought out two more affordable models in its 28nm Radeon HD range. The 7770 is priced at $169 and claims to be the world's first reference GPU that comes factory clocked to 1GHz. Meanwhile, the 7750 comes in at $109 and boasts a low enough wattage (75W, versus 100W for the 7770) that it doesn't require its own power connector. Both cards pack 1GB RAM and run on AMD's Cape Verde architecture, which makes them slightly different to the Tahiti-powered 7900 series, although they do inherit key top-end features like ZeroCore Power, PowerTune and Eyefinity 2.0.Reviewers have mixed opinions, as befits a healthy blogosphere, but the low-power 7750 generally comes off slightly better, especially for those looking to build a budget or HTPC rig. AnandTech likes the power-to-performance ratio of both cards, but dislikes the price-to-performance of the 7770, noting that the older 6850 still offers more in this respect -- at least for gamers. HotHardware concludes that AMD might have "technically" priced both cards "just right," considering how they stack up against NVIDIA's GeForce GTX560 and 550, but in practice those NVIDIA cards deliver a lot more punch for just a few extra dollars. Feel free to glean further details for yourself via the PR and review links below.
