VTX3D HD 7870 Black Edition 2 GB Review 36

VTX3D HD 7870 Black Edition 2 GB Review

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Towards late-November last year, AMD made a halfhearted attempt at launching a new performance-segment GPU that strikes a price-point right in between the Radeon HD 7870 GHz Edition and the Radeon HD 7950, and that's putting it mildly. There was confusion over specifications and name until the very last minute. AMD finally decided not to make a reference-design card which left the decision to its partners, most of whom decided against releasing the SKU so as not to disturb their swelling HD 7870 GHz Edition and HD 7950 inventories. To make matters worse, AMD chose the brilliant SKU name of "Radeon HD 7870".

Amongst the AMD board partners that opted to make cards based on this chip, which has been codenamed "Tahiti LE," are Sapphire and those that rely on contract manufacturer TUL Corporation. These board partners include Club3D, PowerColor, and VTX3D, and the latter two are even owned by TUL. Today, we have with us VTX3D's contraption called the HD 7870 Black.

AMD's new GPU is called "Tahiti LE" even though it's a part of the Radeon HD 7800 series, because it is derived off the same 3.5 billion-transistor "Tahiti" silicon that goes into making all Radeon HD 7900 series products, not the "Pitcairn" silicon that goes into making the HD 7870 GHz Edition and HD 7850. The new SKU drops the "GHz Edition" moniker by featuring lower clock speeds than the HD 7870 GHz Edition, but it makes up for that with more pixel-crunching muscle.

The HD 7870 "Tahiti LE" is carved out of the Tahiti silicon by disabling a fourth of its Graphics CoreNext clusters, which results in a stream processor count of 1,536, a texture memory unit (TMU) count of 96, and a raster operations processor (ROP) count of 32. The memory bus width has been reduced by a third; now, it is 256-bit wide and holds 2 GB of memory. The new chip features PowerTune with Boost: a dynamic core overclocking equivalent to NVIDIA's GPU Boost. The card ships with a GPU clock speed of 925 MHz, PowerTune boost clock of 975 MHz, and 6.00 GHz memory for a memory bandwidth of 192 GB/s.

HD 7870 Tahiti LE Market Segment Analysis
HD 6950
GTX 570
HD 6970
HD 7850
GTX 660
HD 7870
7870 Black
GTX 580
GTX 660 Ti
HD 7950
GTX 670
HD 7970
Shader Units140848015361024960128015365121344179213442048
Graphics ProcessorCaymanGF110CaymanPitcairnGK106PitcairnTahitiGF110GK104TahitiGK104Tahiti
Memory Size2048 MB1280 MB2048 MB2048 MB2048 MB2048 MB2048 MB1536 MB2048 MB3072 MB2048 MB3072 MB
Memory Bus Width256 bit320 bit256 bit256 bit192 bit256 bit256 bit384 bit192 bit384 bit256 bit384 bit
Core Clock800 MHz732 MHz880 MHz860 MHz980 MHz+1000 MHz975 MHz772 MHz915 MHz+800 MHz915 MHz+925 MHz
Memory Clock1250 MHz950 MHz1375 MHz1200 MHz1502 MHz1200 MHz1500 MHz1002 MHz1502 MHz1250 MHz1502 MHz1375 MHz
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May 17th, 2022 01:50 EDT change timezone

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