Compare specs - AMD Radeon HD7770 1 GB vs. Radeon HD7750 1 GB graphic cards


Read the spec by spec comparison of AMD Radeon HD7770 1 GB and Radeon HD7750 l GB. See how both the graphic card fare in their battle of features. Read this article to know which is the better graphic card between AMD Radeon HD7770 1 GB vs. Radeon HD7750 l GB

AMD is effectively pitching the HD 777O 1 GB and HD 7750 l GB as low-end to mid range parts, replacing the ageing HD 5770 l GB at the lucrative £100 price point. Confusingly however, this pitches the new releases head -to-head with both the HD 6870 1GB and HD 6850 1GB from the previous generation, which have been heavily discounted since their release and now also hover around that enticing £100 price point.

While the transition from the HD 79703GB to the HD 79503GB saw only four compute units (256 stream processors) cut from the full-sized TahitiXT GPU, the HD 777O 1 GB and HD 7750 1GB's Cape VerdeXT and Caper Verde Pro GPUs haven't been so fortunate. The GPUs have been given a chop that's worse than being cut in half, with a single front-end engine and just a pair of 64-bit dual channel memory controllers (for a 128-bit memory interface) in place of the 384-bit memory interface of the high-end cards. The ROP count has been halved as well from 32 to 16.

The reduction in compute units of graphic cards is the most important cut though. The HD 7770 1GB wields only ten compute units for a total of 640 stream processors and 40 texture units, while the HD 7750 1GB offers eight compute units for a total of 512 steam processors and 32 texture units.

While the base architecture of graphic cards is the same as that of the HD 79703GB, with each compute unit (AMD refers to them as GCNs) sub-divided into four SIMD engines of 16 stream processors, we really weren't expecting such significant cuts for the Cape Verde GPUs.

However, the reductions in GPU assets of the graphic cards have had the benefit of reducing the physical size of the GPU; both the HD 7770 1GB and HD 7750 1GB's GPUs pack 1.5 billion transistors into a l23mm square die, compared to the 4.3 billion transistors in the HD 7900 series' 352 mm2 die. This has enabled AMD to increase the stock clock speeds, with the HD 7770 1GB the first GPU to ship with a l GHz core frequency, although the HD 7750 runs at a slightly more conservative 850MHz core frequency

As both the HD 7770 and HD 7750 cards have the same 128-bit memory interface and 1GB of GDDR5, not surprisingly they have the same RAM frequency of 1,125 MHz (4.5GHz effective) too. This results in a maximum memory bandwidth of 72 GB/sec; less than a third of the HD 7950 3GB's 240 GB/sec bandwidth. While we expect mid-range and low-end GPUs to be cut-down versions of higher-endchips, AMD has really gone to town with cutting the Cape Verde architecture, and it's a greatly reduced GPU as a result.

However, while the specs sheet looks grim, the HD 7770 1GB and HD 7750 1 GB feature sets are very good. Almost all the features of AMD's high-end cards have made the transition, with support for up to six displays in Eyefinity PCI-E 3.0 support, AMD's 3D technology HD3D and, most importantly AMDs ZeroCore technology. This enables the CPU to drop to an ultra low power state when your PC switches off the display gong as far as turning off the card's cooling fan.

Due to the reduction in CPU size, the HD 7770 and HD 7750 are suitably more diminutive than their high- end siblings too. The stock HD 7770's PCB measures just 210mm, with a dual-slot cooler fitted on top of the GPU and a single side-mounted 6-pin PCI-E power connector The stock HD 7750 1GB is even smaller, measuring 168mm, and only takes up a single slot with its 1cm-profile aluminium vapor chamber cooler. The HD 7750 1GB is also a little special as it requires no PCI-E power connector, drawing all its power from the PCI-E slot. This makes it ideal for use in media centre PCs where space and cabling are at a premium. However, these stock models are surprisingly rare at retailers, with most graphics partners preferring to use their own coolers and PCBs.

Both cards also sport multiple display outputs, with the HD 7770 1GB offering a sinqle DVI and HDMI port, and a pair of Mini DisplayPorts, while the HD 7750 1GB features a single DVI port, HDMI port and full-sized DisplayPort. Only the HD7770 lGB packs a CrossFireX connector though.

Specifications of AMD Radeon HD7770 1 GB and Radeon HD7750 l GB


AMD Radeon HD 7770 1GB features
Price: around £125
Graphics processor: AMD Radeon HD 7770, 1 GHz
Pipeline: 640 stream processors (1GHz), 16 ROPs
Memory: 1GB GDDRS, 4.5 GHz effective
Bandwidth: 72 GB/sec, 128-bit interface
Compatibility: DirectX 11.1, OpenGL 4.1
Outputs/inputs: DVI, HDMI, 2 x Mini Display Port, 1 x CrossFireX
Power connections: 1 x 6-pin, side-mounted
Size: 2l0 mm long, dual-slot

AMD Radeon HD 7750 1GB features
Price: around £95
Graphics processor: AMD Radeon HD 7750, 825 MHz
Pipeline: 512 stream processors (825 MHz), 16 ROPs
Memory: 1GB GDDRS, 4.5 GHz effective
Bandwidth: 72 GB/sec, 128-bit interface
Compatibility: DirectX 11.1, OpenGL 4.1
Outputs/inputs: DVI, HDMI, 2 x Mini DisplayPort
Power connections: None
Size: 168 mm long, single-slot

Read performance comparison between AMD Radeon HD7770 1 GB vs. Radeon HD7750 1 GB


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