Size, noise and heat generation
This is an entry level card and therefore isn’t very long (under 17 cm). The cooling system that equips the model sent to the press is unlikely to be used on the versions released by AMD’s various partners and so much the better! The fan is particularly annoying. Whether in idle or in games the noise that comes from it is particularly strident.
The graphics chip however hardly heats at all and remains at around 30°C at idle and 68°C during gaming. Some partners are even likely to be offering modles without fans.
At idle it’s no surprise to see that the HD7750 is in line with the rest of the Radeon HD7000 range: our machine only consumes 85 Watts in idle and drops to 75 Watts in ZeroCore Power mode, with the screen on standby. More details on ZeroCore Power technology can be found in our Radeon HD7970 test.
In gaming, we were a little disappointed as consumption reached 245 Watts. This is only slightly down on the Radeon HD7770 (256 Watts), which does nevertheless perform a good deal faster, as we’ll see below. Still, the HD7750 is a good deal better than the ‘old’ Nvidia GeForce GTX 550 Ti for which we had readings of 90 Watts in idle and 330 Watts during games under the same conditions.
From 640 processing units on the Radeon HD7770 we're down to 512 units on the Radeon HD7750, which also has a lower running clock: 800 MHz, compared to 1 GHz on the 7770. The number of units given over to textures has also been reduced, going from 40 to 32. The gigabyte of memory (DDR5 on a 128-bit bus) is however identical (1125 MHz) on both models.
The differences in the tech specs of the cards translate to a performance difference of around 23% in games! The Radeon HD7750 is thus barely on a par with the Nvidia GeForce GTX 550 Ti and 10% down on the Radeon HD6790 (old generation).
This isn’t disastrous and this sort of performance still allows you to play the latest 3D titles, though on a full-HD screen you will have to lower the settings in games.
It has to be said that, as with the Radeon HD7770, the gain in performance in games isn't much to speak of. We do however appreciate the reduction in energy consumption.
Consult the performance index table