Design and Specifications

The EVGA GeForce GTX 275 1792MB is a copy of Nvidia’s reference card with twice the amount of memory chips. The PCB revisions even coincide: both copies of GeForce GTX 275 are marked as “180-10897-****-B01”.

The power circuit controller is based on an ADP4100 chip from ON Semiconductor. It controls a six-phase voltage regulator with three MOSFETs in each phase. The memory voltage regulator is based on uPI Semiconductor UP6161N and ENE Technology P2349WF chips (the latter is similar to the Intersil 6549CBZ). External power is connected via two 6-pin PCIe 1.0 plugs. The PCB does not provide for the installation of an 8-pin PCIe 2.0 connector.

Like in the standard version of GeForce GTX 275, the PCB carries 14 memory chips with a 448-bit interface. Each chip is 1024 rather than 512Mb, so the total amount of graphics memory is 1792 rather than 896MB. Despite this difference, the memory works at the reference frequency of 1134 (2268) MHz, ensuring a peak bandwidth of 127GBps.

The GPU is not pre-overclocked, either. Its main domain is clocked at 633MHz and its shader domain, at 1404MHz. The RBE and memory controller subsystem is cut down in comparison with the GeForce GTX 285. This card has 28 RBEs while the GTX 285 has 32. There is no difference between them otherwise. Both have 80 texture and 240 unified shader processors.

As opposed to an earlier-tested GeForce GTX 275 that lacked analog video output, the EVGA GeForce GTX 275 1792MB offers a full selection of interfaces including the above-mentioned universal 7-pin mini-DIN port, two DVI-I connectors, two MIO connectors, and a 2-pin S/PDIF.

The graphics card from EVGA is equipped with Nvidia’s cooler, so we won’t discuss its design in detail. We can just remind you briefly that the cooler consists of a composite aluminum heatsink and a copper heat-exchanger that are connected with heat pipes. The cooler is covered with a plastic casing and has a blower. The hot air is exhausted out of the system case through the slits in the graphics card’s mounting bracket. The whole arrangement is secured on the PCB with numerous spring-loaded screws – there is no risk of any misalignment. This is a time-tested design that can ensure acceptable cooling performance at a comfortable level of noise.