Club 3D HD 7870 jokerCard Tahiti LE 2 GB

Club 3D HD 7870 jokerCard Tahiti LE 2 GB

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Introduction



Towards late-November, 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 only AMD board partners that opted to make cards based on this chip, which has been codenamed "Tahiti LE," are 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 Club3D's contraption called the HD 7870 jokerCard;It is a part of Club3D's Poker Series.



AMD's new GPU is called "Tahiti LE" even though it's a part of the Radeon HD 7800 series, because it is derived from the same 3.5 billion-transistor "Tahiti" silicon that goes into making all Radeon HD 7900 series products and 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
 Radeon
HD 6950
GeForce
GTX 570
Radeon
HD 6970
Radeon
HD 7850
GeForce
GTX 660
Radeon
HD 7870
Club3D HD
7870 jokerCard
GeForce
GTX 580
GeForce
GTX 660 Ti
Radeon
HD 7950
GeForce
GTX 670
Radeon
HD 7970
Shader Units140848015361024960128015365121344179213442048
ROPs324032322432324824323232
Graphics ProcessorCaymanGF110CaymanPitcairnGK106PitcairnTahitiGF110GK104TahitiGK104Tahiti
Transistors2640M3000M2640M2800M2540M2800M4310M3000M3500M4310M3500M4310M
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
Price$170$250$380$185$230$245$270$430$280$310$380$390
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