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Difference Between Radeon HD 4890 (RV790) And Radeon HD 4870 (RV770):
RV790 is nothing of an advancement in technology rather an advancement in RV770 graphics processor. RV770 and RV790 looks similar, but they are not identical, RV790 comes with a different layout of the die and the pin count is also not compatible with RV770 boards.
Beside higher clock speed ATI’s RV790 has improved shader efficiency, which will help RV790 to perform a bit faster than it’s predecessor RV770 even at the same clock and specification. ATI actually done something good with the shaders of RV790 to improve overall performance of the graphics processor. Higher clocks will require more power and 6+8 pin power connectors present in HD 4890 instead of 6+6 ones of HD 4870 is a sign of that.

Radeon HD 4890 Specifications:
So far the specifications that have leaked for this card are here:
HD 4890 has core clock speed of 850MHz, 256-bit wide memory interface, 1GB GDDR5 memory which is clocked at 975 MHz (effective 3900MHz Quad pumped), with memory bandwidth of 124.8GB/s up from the 111GB/s of its predecessor, the HD 4870. It has 800 stream processors, fabricated at 55nm, supports DirectX 10.1, SM4.1 and is CrossFireX ready.
These are reference clocks and we can expect even higher clocks with overclocked versions from ATI partners.

Radeon HD 4890 Price:
Rumors are this card will cost US $249.

Radeon HD 4890 Availability:
ATI is said to launch it’s upcoming video card Radeon HD 4890 on Thursday, April 9th.

Catalyst Control Center
View of Catalyst Control Center with Radeon HD 4890 installed.

Catalyst Control Center

Catalyst Control Center

ATI reference design Radeon HD 4890:
While we are at this topic I should show you guys the upcoming Radeon HD 4890, it’s from ATI and it’s reference design, but we can expect some custom designed HD 4890 video cards after it’s official launch.

ATI HD 4890 Reference Design

ATI HD 4890 Reference Design

Reference Design ATI HD 4890

Reference Design ATI HD 4890

ATI HD 4890 RV790

ATI HD 4890 RV790

Radeon HD 4890 from PowerColor and Gigabyte in these pictures:

Gigabyte GV-R489-1GH-B

Gigabyte GV-R489-1GH-B

Gigabyte Radeon HD 4890

Gigabyte Radeon HD 4890

Powercolor Radeon HD 4890

Powercolor Radeon HD 4890


ATI Vs Nvidia!
ATI, the graphics division of AMD is working full force to win the battle which is going on between them and Nvidia, I know that right now Nvidia is the king when it comes to high-end graphics cards, their single gpu GeForce GTX 285 and dual gpu GeForce GTX 295 are unbeatable but ATI is taking the lead in mid-range cards with price vs performance ratio.
ATI, after cutting prices for their Radeon HD 4800 series has become very competitive for Nvidia in mainstream level.

Nvidia GeForce GTS 250 VS ATI Radeon HD 4870!
ATI Radeon HD 4870 is a performance mainstream video card that performs close to and in some games neck-to-neck with Nvidia’s GeForce GTX 260 (216 Core) video card and Nvidia’s GeForce GTX 260 (216 Core) graphics card is available for around $240.00 whereas ATI’s Radeon HD 4870 card sells for around $210.00, so, price/performance ratio wise ATI wins here.
Nvidia recently launched GeForce GTS 250 video card and Radeon HD 4850 video card which sells for around $150.00 is the main competitor of GeForce GTS 250. Benchmarks seen over at internet shows that GeForce GTS 250 takes the lead in most of the games over Radeon HD 4850 and GeForce 9800 GTX+.
If you will compare GeForce GTS 250 to Radeon HD 4870, GeForce GTS 250 will left behind by Radeon HD 4870 in almost all of the games, so, I don’t think there is any point in comparing GTS 250 with HD 4870.
This battle which is going on between ATI and Nvidia is not going to over here because when one company take some action the other one does something in it’s reaction, so, expect more to come your way, it’s good for you. 🙂

GTS 250 Price And Availability:
At the moment there are only three GeForce GTS 250’s are available and most of them are available for pre-order, from three available cards one is from XFX which is a 512MB version with stock clocks for $149.99 and the other one is from Gigabyte for $179.95 which is a 1GB version with Zalman cooling fan installed on it and there is also a 512MB overclocked version from BFG available for $169.99.
These GeForce GTS 250 video cards are based on 55nm G92b, featuring 128 stream processors, these card require only one 6pin power supply connector.
XFX GeForce GTS 250 GS-250X-YDFC
Bus Type: PCI-E 2.0
GPU Clock: 738 MHz
Memory Bus: 256Bit
Memory Type: DDR3
Memory Size: 512MB
Memory Speed: 2200 MHz
Shader Clock: 1836MHz

XFX GeForce GTS 250 GS-250X-YDFC

XFX GeForce GTS 250 GS-250X-YDFC

Gigabyte GeForce GTS 250 GV-N250ZL-1GI
Bus Type: PCI-E 2.0
GPU Clock: 740 MHz
Memory Bus: 256-Bit
Memory Type: DDR3
Memory Size: 1GB
Memory Speed: 2000 MHz
Shader Clock: 1850MHz
This card from Gigabyte is cooled by a Zalman OEM VF1050 cooler with copper fins and 4 heatpipes.

Gigabyte GeForce GTS 250 GV-N250ZL-1GI

Gigabyte GeForce GTS 250 GV-N250ZL-1GI

BFG GeForce GTS 250 OC
Bus Type: PCI-E 2.0
GPU Clock: 750MHz
Memory Bus: 256-Bit
Memory Type: DDR3
Memory Size: 512MB
Memory Speed: 2240MHz
Shader Clock: 1863MHz

BFG GeForce GTS 250 OC

BFG GeForce GTS 250 OC

Checkout all these and other GeForce GTS 250 video cards Inside!

AMD/ATI has decided to fight back to Nvidia’s new GTX 295 cards, instead of sitting idle watching their crown being taken away from them they decided to response. Which is good in my opinion, why? you ask, this competition between both company will bring us more high performing cards at lower prices. 😀
Advanced Micro Devices (AMD) has decided to lower the price for their flagship graphic card ATI Radeon HD 4870 X2 2GB down to $449 which was previously at $549. So, they reduced cost of $100 and some of ATI’s partners are giving $50 rebate making it $399 card, though I am sure it’s still expensive for some of you out there, the price cut is a good news. ATI is trying to grab about 50% of the market of standalone desktop graphics cards. To achieve this goal their strategy is to lower cost for their cards.

Checkout these two ATI Radeon HD 4870 X2 cards, one of them is from Sapphire.

SAPPHIRE 100251SR Radeon HD 4870 X2
SAPPHIRE 100251SR Radeon HD 4870 X2

SAPPHIRE 100251SR Radeon HD 4870 X2
Core Clock: 750 MHz
Memory Clock: 1800 MHz (900 MHz x 2)
2.4 teraFLOPS of GPU power
1600 (800 x 2) Stream Processing Units
Memory Size: 2GB (2x 1024MB)
Memory Interface: 512-bit (256-bit x 2)

SAPPHIRE 100251SR Bundle
SAPPHIRE 100251SR Bundle

Purchase Sapphire Radeon HD4870 X2 2GB DDR5 Graphics Card-Click Here!

Also there is a OC version of HD 4870 X2 from Diamond.

Diamond 4870X2PE52GXOC
Diamond 4870X2PE52GXOC

Diamond 4870X2PE52GXOC Radeon HD 4870 X2
Core clock: 800MHz
Memory Clock 1950MHz (975 MHz x 2)
1600 (800 x 2) Stream Processing Units
Memory Size: 2GB (2x 1024MB)
Memory Interface 512-bit (256-bit x 2)