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PCB Design and Cooling System

The EVGA e-GeForce 7900 GT CO SuperClocked uses the standard PCB design and doesn’t differ from the reference sample of GeForce 7900 GT which we described in our article called Nvidia GeForce 7900 GT Review.

 

The only detail that distinguishes this product from the prototype is a sticker with the EVGA logo on the cooler. Nvidia’s logotype on the PCB indicates that this is a standard GeForce 7900 GT manufactured at Foxconn’s facilities.

The revision A2 graphics chip is dated the sixth week of the current year, i.e. the middle of February. The core is clocked at 550MHz or 100MHz higher than described in the official specs. The card carries eight K4J55323QG-BC14 memory chips from Samsung in 136-pin FBGS packaging. These chips have 8Mx32 organization, 256Mbit capacity and 1.8V voltage. The suffix BC14 means that the chips are rated to work at 700 (1400) MHz, but here they are already overclocked by the manufacturer to 790 (1580) MHz. EVGA guarantees stability of its product at the higher frequencies, but you cannot of course hope for any success at overclocking. The total amount of graphics memory is 256MB.

EVGA didn’t trouble itself with installing an original cooler, but took a reference cooler instead (we described it in our GeForce 7900 GT review). It is designed in a simple way: the ribbing is glued to the copper base and the whole is covered under an air-directing plastic casing. The cooler is equipped with a small but rather noisy blower with a diameter of 45mm and cools the GPU die only.

This is enough for cooling a standard GeForce 7900 GT because the G71 chip doesn’t generate much heat at 450MHz. But the core of the e-GeForce 7900 GT CO SuperClocked works at 550MHz, so the reference cooler may find it difficult to do its job, especially if your system case is poorly ventilated. The memory chips are not cooled at all, although its frequency is above the normal one for the access time of 1.4 nanoseconds.

 
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