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Radeon HD 5750: PCB Design and Cooling System

The Radeon HD 5750 is even shorter than the Radeon HD 5770 at only 18.5 centimeters, which is a record for a graphics card with that much power. The cooling system is much simpler and employs an ordinary axial fan.

Like on the senior model of the series, half of the memory chips are on the reverse side of the PCB. Dismantling the cooling system is easy, too. You only have to unfasten four screws on the X-shaped back-plate. The face side of the PCB looks like this:

The card is compact indeed and is populated as densely as the Radeon HD 5700. The 3-phase GPU voltage regulator is controlled by an uP6201 chip from uPI Semiconductor. A single-phase memory power circuit is based on an uP6101 chip from the same maker.

Like in the senior model of the series, one 6-pin PCIe 1.0 connector is used to connect external power.

Like on the Radeon HD 5770, Hynix H5GQ1H24AFR-T2C chips of GDDR5 memory are used. Again, they have a capacity of 1Gb, a voltage of .5V and a rated frequency of 1250 (5000) MHz. The memory frequency is just slightly lower than that of the senior model – 1150 (4600) MHz. This provides a memory bandwidth of 73.6GBps. That’s an unprecedented level for a $100 solution.

This sample of the RV830 is manufactured on the 34th week of this year, too. However, it is configured differently on the Radeon HD 5750. One of the SIMD cores is turned off. Thus, the graphics card has 144 shader processors out of 160 (720 out of 800 ALUs) and 36 out of 40 texture-mapping units. The number of RBEs has remained the same at 16. The GPU frequency is only 700MHz but the Radeon HD 5750 is no weakling. It should set a new performance record in the $100 category!

Like the faster Radeon HD 5800 series cards, this model has two dual-link DVI-I ports, one HDMI port and a DisplayPort. It supports CrossFireX, too.

The reference cooling system of the Radeon HD 5750 is very simple and resembles Thermaltake Orb series solutions, differing only in size. It is based on a round aluminum heatsink cooled by an 80mm axial fan. The fan uses a 2-pin connection.

There is a layer of dark-gray thermal grease on the cooler’s base. A piece of protective film with a cutout against the GPU die can also be seen. The cooler is fastened with four poles and a spring-loaded back-plate. The egg-shaped plastic cap may also serve a practical purpose by driving some air along the PCB to cool the power transistors of the voltage regulator.

Considering the reduced frequency and cut-down functionality of the Radeon HD 5750 graphics core, the above-described design looks sufficient to cool the junior model of the new series of mainstream graphics cards from AMD.

 
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