Subject: Graphics Cards | March 22, 2013 - 01:56 PM | Jeremy Hellstrom
Tagged: hd 7790, graphics core next, GCN, ea Islands, bonaire, amd
AMD is trying to fill a gap in their product line between the less than $200 HD 7850 and the ~$120 HD 7770 with a $150 card, the HD 7790. The naming scheme implies two GPUs but this is not the case, it is a single Bonaire GCN chip with 896 stream processors, 56 texture units and an impressive fill rate of up to 1.79 TFLOPS thanks to some optimization of the GCN architecture. It has 1GB of GDDR5 at 6GHz effective and a CPU speed dependent on the model, in [H]ard|OCP's case the ASUS Radeon HD 7790 DirectCU II OC runs at 1.075GHz. [H] passed it a Silver Award for being a vast improvement over the 7770 and good competition for the GTX 650 Ti but feel the card does need to be faster.
This card also makes an appearance on our front page, with a lot of Frame Rating charts so you can see not only the raw FPS data you are used to, but also an indept look at how the game is going to 'feel' while you play.
"AMD is launching the Radeon HD 7790 today. This new video card should give the sub-$200 video card segment a kick in the pants. Will it provide enough performance for today's latest games at $149? We will find out, testing the new ASUS Radeon HD 7790 DirectCU II OC with no less than six of today's hottest games."
Here are some more Graphics Card articles from around the web:
- AMD's Radeon HD 7790 @ The Tech Report
- AMD Radeon HD 7790 review (incl. frametimes) @ Hardware.info
- AMD Radeon HD 7790 @ TechSpot
- AMD Radeon HD 7790 Review @ Hardware Canucks
- Sapphire Radeon HD 7790 Dual-X 1GB OC @ eTeknix
- Sapphire Radeon HD 7790 1GB Dual-X OC @ Tweaktown
- Sapphire HD 7790 1GB Graphics Card @ Bjorn3D
- Sapphire Radeon HD 7790 Dual-X OC Review @ OCC
- Sapphire HD 7790 Dual-X OC Video Card Review @ Hi Tech Legion
- AMD Radeon HD 7790 CrossFire @ techPowerUp
- ASUS HD 7790 DirectCU II OC @ Overclockers.com
- Sapphire HD 7790 Dual-X 1 GB @ techPowerUp
- AMD Radeon HD 7790 Video Card Review w/ Gigabyte & Sapphire @ Legit Reviews
- ASUS HD 7790 Direct CU II OC 1 GB @ techPowerUp
- Sapphire HD7790 OC @ Kitguru
- PowerColor PCS+ HD 7850 Radeon Graphic Card Review @ Pro-Clockers
- HIS Radeon HD 7850 iPower IceQ Turbo 4GB Video Card in CrossFire @ Tweaktown
- HIS Radeon HD 7770 iCooler 1GB Overclocked @ Tweaktown
- Mid-Range AMD Graphics Card Round-Up (HIS 7770 GHz / HIS 7850 / Sapphire 7850) @ Kitguru
- PowerColor PCS HD7870 MYST Video Card Review @ Legit Reviews
A New GPU with the Same DNA
When we talked with AMD recently about its leaked roadmap that insinuated that we would not see any new GPUs in 2013, they were adamant that other options would be made available to gamers but were coy about about saying when and to what degree. As it turns out, today marks the release of the Radeon HD 7790, a completely new piece of silicon under the Sea Islands designation, that uses the same GCN (Graphics Core Next) architecture as the HD 7000-series / Southern Islands GPUs with a handful of tweaks and advantages from improved clock boosting with PowerTune to faster default memory clocks.
To be clear, the Radeon HD 7790 is a completely new ASIC, not a rebranding of a currently available part, though the differences between the options are mostly in power routing and a reorganization of the GCN design found in Cape Verde and Pitcairn designs. The code name for this particular GPU is Bonaire and it is one of several upcoming updates to the HD 7000 cards.
Bonaire is built on the same 28nm TSMC process technology that all Southern Islands parts are built on and consists of 2.08 billion transistors in a 160 mm2 die. Compared to the HD 7800 (Pitcairn) GPU at 212 mm2 and HD 7700 (Cape Verde) at 120 mm2, the chip for the HD 7790 falls right in between. And while the die images above are likely not completely accurate, it definitely appears that AMD's engineers have reorganized the internals.
Bonaire is built with 14 CUs (compute units) for a total stream processor count of 896, which places it closer to the performance level of the HD 7850 (1024 SPs) than it does the HD 7770 (640 SPs). The new Sea Islands GPU includes the same dual tessellation engines of the higher end HD 7000s as well and a solid 128-bit memory bus that runs at 6.0 Gbps out the gate on the 1GB frame buffer. The new memory controller is completely reworked in Bonaire and allows for a total memory bandwidth of 96 GB/s in comparison to the 72 GB/s of the HD 7770 and peaking theoretical compute performance at 1.79 TFLOPS.
The GPU clock rate is set at 1.0 GHz, but there is more on that later.