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AMD Radeon HD 4870 X2 2X1Gb Xtreview exclusive review
Posted:2008-07-14 By Video card review
Number of View:217787



By :Video card review


xtreview is your : Video card - cpu - memory - Hard drive - power supply unit source

AMD Radeon HD 4870 X2 2X1Gb Xtreview exclusive review

The official announcement of R700 video cards will be only in August, and today we can only briefly introduce the R700 : This is the two-processor RADEON HD 4870. Therefore it so is called  RADEON HD 4870 X2. In contrast to 4870 with 512 megabyte memory , this product contain 2 x 1024 memory. Let us pass to the full specification of r700 cards (two chips RV770) .




ATI RADEON HD 4870 X2 2x1024MB PCI-E

ATI RADEON HD 4870 X2 2x1024MB

ATI RADEON HD 4870 X2 2x1024MB

ATI RADEON HD 4870 X2 2x1024MB

ATI RADEON HD 4870 X2 2x1024MB GDDR5

  • Technology of production 55 nm
  • Two chips 956 million transistors
  • Standardized architecture
  • Hardware support to directX 10.1, including new shader model : Shader model 4.1
  • Two 256- bit memory, on four controllers with 64 bits .support to GDDR3 and GDDR5 memory
  • Core frequency 750 MHz
  • 2 x 10 SIMD core, which include 2 x  800 scalar ALU for calculations with the floating point (integral and floating sizes, support FP32 and FP64 within the standard IEEE 754)
  • 2 x 10 textural blocks, with FP16 and FP32 support
  • 2 x 40 blocks textural addressing
  • 2 x 40 blocks bi-linear filtration with the possibility of FP16 textures filtering  at full speed and support to tri-linear and anisotropic filtration for all textural sizes
  • 2 x 16 blocks ROP with support to regimes anti-aliasing .
  • integrated support of four RAMDAC, four ports dual link DVI, HDMI, HDTV, display-Port .

Here the standard card specification :

  • GPU: 2 x RADEON HD 4870 (RV770)
  • Interface: PCI-Express x16
  • GPU (ROPs/Shaders) frequencies: 750/750 MHz (rating - 750/750 MHz)
  • Memory frequencies  (physical (effective)): 900 (3600) MHz (rating - 900 (3600) MHz)
  • Memory width : 2 x  256bit
  • Number of universal processors: 2 x 800
  • Number of textural processors: 2 x 40 (BLF/TLF)
  • Number Of rOPs: 2 x 16
  • Sizes: 270x100x33 mm
  • Textolite color black
  • RAMDACs/TDMS: integrated in GPU.
  • 2xDVI (Dual-Link/HDMI), TV-out.
  • VIVO: no
  • TV-out: integrated in GPU.
  • Support of multiprocessor work: Crossfire (Hardware).


It is obvious that design concept after transfer from the HD 3870 x2 touched only the special features of  DDR5 memory and the stronger requirements for the power circuit. The card include new bridge PEX from PLX technologies, which ensures internal Crossfire regime between the cores. The Cooling system is the same as in 3870 X2, but here the radiators was intensified  .

The memory microcircuits are cooled by special plate- radiator. Those cards are equipped with their own sound codec; therefore precisely this sound is transferred to HDMI (with the aid of DVI-to-HDMI adapter).

Let us also note that the video card power is achieved with the aid of one 6- pin and 8- pin connector. Those cards are supplied with adapters DVI-to-HDMI .

Maximum resolutions and frequency: 240 Hz max refresh  rate , 2048 x  1536 x 32bit x85Hz  max

Analog interface 2560 x 1600 @ 60Hz max

Unfortunately the utility  rivaTuner does not support this new series therefore there is no monitoring. However, the card heat up strongly, and the core temperature can be 80 C and higher .Here is the configuration used in this test : 

Computer on  base Of intel core2 (775 Socket) : processor intel core2 extreme QX9650 (3000 MHz);

  • Motherboard zotac  790i Ultra ; chipset NVIDIA nForce 790i Ultra;
  • 2 GB DDR3 SDRAM corsair 2000MHz (CAS (tCL) =5; RAS to CAS delay (tRCD) =5; Row precharge (tRP) =5; tRAS=15);
  • Hard drive WD caviar SE WD1600JD  160GB SATA.
  • Power unit tagan TG900-BZ 900W.
  • Operating system Windows vista 32bit SP1; DirectX 10.1;
  • Monitor dell 3007WFP (30").
  • Drivers ATI version CATALYST 8.6; NVIDIA  version 175.16 (9XXX series) and 177.34 (GTX 2xx).
  • VSync enabled.

We used:

  • 3DMark vantage 1.00 (FutureMark) - DirectX 10.0, shaders 4.0, Extreme
  • World In conflict 1.007 (Massive entertainment/Sierra) - DirectX 10.0, shaders 4.0,  maximum quality (very high with AA and AF).

It is obvious that the new X2 card theoretically can be 2 times faster than 4870, but actually this value is from 1.5 to 1.8 times ( sometimes less ). Yes, looking at the graphs and the excellent numbers , it is necessary to have in mind that generally the two-processor card have a large deficiency: the programmed control assignment between the processors; therefore the degree of adjustment and productivity in  games  depends on how programmers worked above the appropriate driver.

In any case, we will investigate further this question, and final clarity will appear already up to the  announcement moment . We regret that AMD completely forewent the release of single core powerful solutions .Now we can wait for NVIDIA reciprocal actions. And we again emphasize that the verdict IS NOT FINAL! Wait for our further studies!

xtreview is your : Video card - cpu - memory - Hard drive - power supply unit source

AMD Radeon HD 4870 X2 2X1Gb Xtreview exclusive review

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