Power Consumption, Temperature, Noise, Overclocking
Although the EVGA only differs from the reference GeForce GTX 275 with the double amount of graphics memory, we measured its power consumption to check out the effect of the memory chips on the card’s power draw. The test was performed on a special testbed configured like follows:
- Intel Pentium 4 560 CPU (3.6GHz, LGA775)
- DFI LANParty UT ICFX3200-T2R/G mainboard (ATI CrossFire Xpress 3200 chipset)
- PC2-5300 SDRAM (2x512MB, 667MHz)
- Western Digital Raptor WD360ADFD HDD (36GB)
- Chieftec ATX-410-212 PSU (410W)
- Microsoft Windows Vista Ultimate SP1 32-bit
- Futuremark PCMark05 Build 1.2.0
- Futuremark 3DMark06 Build 1.1.0
Following our standard procedure, the 3D load was created by the first SM3.0/HDR test from 3DMark06 running in a loop at 1600x1200 with forced 4x FSAA and 16x AF. The 2D load was emulated by the 2D Transparent Windows test from PCMark05. The graphics card worked at its default GPU and memory frequencies.
Predictably, the power consumption is not much different. The results are good, yet the EVGA card, like every other version of GeForce GTX 275, is still far inferior to the Radeon HD 4890 in terms of power efficiency.
The temperature of the EVGA GeForce GTX 275 is similar to that of the reference card, too.
The GPU temperature is higher by a mere 2°C, which must be due to the summer weather and higher room temperature in our labs. As we tested the graphics cards under real-life conditions, i.e. under the same conditions that they are going to be used by gamers, the numbers above should be considered as just approximate.
Using the same cooler, the EVGA GeForce GTX 275 was no different from Nvidia’s reference card in terms of noisiness, either.
Our overclocking attempt was quite a success:
Without any special overclocking methods we increased the GPU frequency to 720/1597MHz and the memory chips to 1184 (2368) MHz. This addition to the default frequencies is big enough to affect the card’s performance in games, so we will test it at the overclocked frequencies, too. We even suspect that overclocking will have a bigger effect on the results of the EVGA GeForce GTX 275 1792MB than its 1792 megabytes of graphics memory. Let’s check this out right now!