Articles: Graphics
 

Bookmark and Share

(16) 
Pages: [ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 ]

As we’ve noted above, there are 14 memory chips on the card for a total of 896 megabytes accessed across a 448-bit bus. These are K4J52324QH-HJ08 chips from Samsung with a capacity of 512Mb (16Mb x 32), voltage of 2.05V, and a rated frequency of 1200 (2400) MHz. 1Gb chips can also be used and graphics cards makers have already released such versions of the new card. They are free from main disadvantage of the reference GeForce GTX 275 in comparison with the Radeon HD 4890 – the smaller amount of memory.

The BFG GeForce GTX 275 OC has a slightly pre-overclocked memory frequency: from 1134 (2268) MHz to 1152 (2304) MHz.

Such a small frequency growth cannot affect the card’s gaming performance.

The GPU is pre-overclocked, too. Its computing domain is clocked at 1440 MHz rather than at the reference card’s 1404 MHz and its main domain is pre-overclocked from 633 to 648 MHz. The latter number equals the GeForce GTX 285’s main domain frequency, by the way. Does it mean that the BFG GeForce GTX 275 OC can beat the GeForce GTX 285? There is a chance for that considering its 240 shader and 80 texture processors, yet the cut-down configuration of the RBEs and memory subsystem should not be disregarded. Well, we will soon see everything in practical tests. The core is revision B3 whereas the GeForce GTX 260 Core 216 uses revision B2. This sample must be able to work at a higher frequency than those cores that are used to manufacture the junior model of the series. The production date is early 2009.

In the left part of the PCB there is an NVIO2 display controller that is not incorporated into the G200 core. There is a difference from Nvidia’s previous PCB designs as the card offers no place for a DisplayPort translator chip. There is no such seat on the reverse side of the PCB, either. Thus, the GeForce GTX 275 is not supposed to support the DisplayPort interface. That’s not a big loss for a games-oriented graphics card, though. There is also no connector for analog video output in Composite, S-Video, YPbPr formats and this is the peculiarity of the BFG card only. There is a seat for the connector on the PCB and it is indeed installed on most other GeForce GTX 275 manufactured by other companies. Analog video formats are becoming obsolete, so BFG is probably right in saving on them, but we don’t think the company can save a lot. There are two MIO connectors on board: Nvidia does not want to deprive a gaming card that stands higher than the GeForce GTX 260 Core 216 (which should be renamed as GeForce GTX 265 already, we guess) of Triple-SLI support.

We can’t say anything new about the cooler: it is a time-tested thing with a copper heat-exchanger connected to a heatsink with heat pipes. The cooler exhausts the hot air though the slits in the graphics card’s mounting bracket. The power circuit components are not cooled specially, just as on the GeForce GTX 260 Core 216. They only get some airflow from the fan through the slits in the base of the cooler.


GeForce GTX 275 cooler


GeForce GTX 260 Core 216 cooler

BFG has saved on the thermal interfaces as well. Instead of pads soaked in thermal grease, there are now lozenges of green rubber-like material in every heat exchange point, excepting the main heat-exchanger that contacts the GPU cap through a layer of ordinary dark-gray thermal grease. The whole arrangement is secured on the PCB with a few spring-loaded screws that prevent any misalignment.

As we’ve said above, this is a time-tested design, so we can expect the new card to be just as good in terms of temperatures and noise as the other GeForce GTX 200 series products.

 
Pages: [ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 ]

Discussion

Comments currently: 16
Discussion started: 05/14/09 10:58:23 PM
Latest comment: 06/22/09 11:11:39 PM

View comments

Add your Comment