NVIDIA GeForce GTX 275
|GeForce GTX 200 Series Comparison|
| GeForce GTX 285||GeForce GTX 280||GeForce GTX 275||GeForce GTX 260 (revised 216 shader)|
|Core Graphics Clock Speed||648MHz||602MHz||633MHz||576MHz|
|Stream Processor Clock||1,476MHz||1,296MHz||1,404MHz||1,242MHz|
|# of Stream Processors||240||240||240||216|
|Memory Clock Speed||1,242MHz (2,484MHz effective)||1,107MHz (2,214MHz effective)||1134MHz (2268MHz effective)||999MHz (1,998MHz effective)|
|Memory Bandwidth||159GB/sec|| 141.7GB/sec||127GB/sec||111.9GB/sec|
|Texture Filtering Units||80||80||80||72|
|Texture Filtering Rate||51.8Gigatexels/sec||48.2Gigatexels/sec||50.6 GigaTexels/sec||41.5 Gigatexels/sec|
|Display Connectors||2xDual-link DVI|
|Max Board Power||183 Watts||236 Watts||219W||182 Watts|
|HDMI||Yes, Via Adaptor||Yes, Via Adaptor||Yes, Via Adaptor||Yes, Via Adaptor|
|Audio Input for HDMI||SPDIF passthrough||SPDIF passthrough||SPDIF passthrough||SPDIF passthrough|
Based on the exact same GT200b GPU used in the GTX 285 and 55-nm GTX 260 launched earlier this year, the GeForce GTX 275 is a bit of a hybrid of sorts in the sense that it features the full 240-shader architecture found in the GTX 280 and GTX 285, yet it retains the 448-bit memory interface used on the GTX 260, with 896MB of memory onboard.
To further separate the GeForce GTX 275 from the GTX 260, NVIDIA also cranks up the clocks rather significantly, as the GTX 275 runs at 633MHz – just 15MHz shy of the flagship GTX 285 – while the stream processors are clocked at 1,404MHz. These speeds are significantly higher than the GTX 260, and even the GTX 280, which was once NVIDIA’s most powerful GPU.
The GeForce GTX 280 eclipses the GTX 275 in only one category: its memory subsystem. While it runs at slower clocks, thanks to one additional 64-bit memory controller, the GTX 280 boasts a 512-bit memory interface with 1GB of memory. This gives the GTX 280 a slightly larger frame buffer and memory bandwidth advantage, but the GTX 275’s texture filtering advantage gives it the edge in cases where the memory subsystem doesn’t come into play.
As you’ll see in our benchmarks, the GTX 275 and GTX 280 run neck-and-neck with each other for the most part, so essentially with the GeForce GTX 275 NVIDIA’s giving you GTX 280 performance at a new lower price point of $249 before rebates.
The GTX 275 board itself is based on the same design and cooling used for other GT200b GPUs. We’ve found that while it gets the job done adequately enough, due to compromises that have been made in the cooling to cut costs, we don’t see the temp reductions we expected out of a smaller, less power hungry 55-nm chip. Load temps are at best on par with, and usually a little higher than their 65-nm counterparts.
Fortunately NVIDIA’s GT200 GPUs were never known for running hot (at least in comparison to RV770), but if you were expecting a cooler-running alternative to the GTX 280 and GTX 260, you’ll likely be a little disappointed. We have found that GT200b GPUs tend to cool down significantly faster than GT200 when going from load down to idle though.
The GeForce GTX 275 is expected to sell for an MSRP of $249, with boards hitting retail in some regions by the end of today, and worldwide retail availability expected by April 14th.
Besides the new graphics card, another new feature NVIDIA is launching today is the addition of ambient occlusion in their ForceWare 185 release driver. The feature is enabled via application profiles, with the ForceWare 185 driver currently capable of supporting ambient occlusion in 22 games:Assassin's Creed
Call of Duty 4
Call of Duty 5
Call Of Juarez
Company Of Heroes
Devil May Cry 4
Half Life 2 series
Left 4 Dead
Lost Planet: Colonies
Lost Planet: Extreme Condition
Team Fortress 2
Unreal Tournament 3
World In Conflict
World of Warcraft
(Note: STALKER: Clear Sky and Crysis natively support ambient occlusion in the game’s graphics menu options)
As of right now the feature is unique to D3D titles, with no plans to add OpenGL support at the moment. The feature looks better in some games than others, with the aforementioned titles in bold delivering the most distinctive improvement visually according to NVIDIA. The neat thing about it is that it’s a feature that can be used to enhance older titles such as those based on the HL2 engine, which already run at blazing frame rates anyway (the performance hit generally ranges from 20-40% according to NVIDIA). NVIDIA provided us with the following before/after screenshots:
Company of Heroes AO off
Company of Heroes AO on
World in Conflict AO off
World in Conflict AO on
Mirrors Edge AO off
Mirrors Edge AO on
Half-Life 2 AO off
Half-Life 2 AO on