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PCB Design and Specifications

The card’s having 1 gigabyte of memory has affected its PCB design. Its PCB resembles the PCB of the Bliss 8800 GT 512MB GS GLH, which is unique as well, but there are certain differences due to the necessity to install twice as many GDDR3 chips.


Like the PCB of the Bliss 8800 GT 512MB GS GLH this one uses a three-phase GPU power circuit governed by a Richtek RT8802A controller (the reference card from Nvidia has a Primarion PX3544 controller). A Richtek RT9259A, instead of an Intersil ISL6549 as on the reference card, is responsible for the memory chips. The load-bearing elements of the power circuit are grouped all together and can thus be cooled by a common heatsink. The PCB has one 6-pin PCI Express 1.0 power connector with a load capacity of 75W. This is more than enough considering the low power draw of G92-based solutions.

The Bliss 8800 GT 1024MB GS uses the same memory as the Bliss 8800 GT 512MB GS GLH, but carries not 8 but 16 GDDR3 chips (Qimonda HYB18H512321BF-10). Eight chips can be found in their traditional places while the other eight are located on the reverse side of the PCB and the PCB wiring has been modified appropriately. These chips work at a voltage of 2.0V and have a rated frequency of 1000 (2000) MHz. The real memory frequency of the card is somewhat lower at 950 (1900) MHz. This is lower than the memory frequency of the GLH-suffixed Bliss 8800 GT but somewhat higher than that of the reference card from Nvidia, 900 (1800) MHz. So, we shouldn’t expect a serious performance boost from this side.

The main GPU domain is pre-overclocked from the standard 600MHz to 650MHz (648MHz as reported by RivaTuner) and the shader domain frequency has increased from 1500 to 1620MHz. These are not as high frequencies as of the GLH version, yet the performance growth should be considerable anyway. The GPU has a standard configuration with 112 universal shader processors grouped into 7 execution units with 16 ALUs in each. The eighth unit present in the G92 chip is disabled here. 28 out of the chip’s 32 texture processors are active, each of them is accompanied with two address and two texture filter units. There are 16 rasterization processors in the chip. Practice suggests that the smaller number of ROPs in the G92 chip as compared with the G80 does not create a bottleneck in modern games.

Besides the standard selection of connectors (a couple of dual-link DVI-I ports plus a universal mini-DIN connector), the card carries a 2-pin S/PDIF plug for internal connection to your sound card in order to enable the audio-over-HDMI feature in case the external mini-DIN port cannot be employed for some reason. Like the GS GLH version with 512 megabytes of memory, this card supports SLI technology.

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