Feeds
85%

AMD Radeon HD 4850 and 4870

Snatching the price:performance crown from Nvidia?

SANS - Survey on application security programs

Review The new AMD 'RV770' graphics chip that lies at the heart of Radeon HD 4850 and 4870 owes a great deal to the 'RV670' that we saw in HD 3850 and 3870. It uses the same 55nm fabrication process and continues to support DirectX 10.1, but the transistor count has risen from 666m to 956m.

That’s a 44 per cent increase in the number of transistors so it’s impressive that the die area has only increased by 37 per cent from 190 to 260 square millimetres.

By the sound of it, AMD has taken baby steps with its new chip but one part of the specification leaps off the page: the number of Stream Processors - aka unified shaders - has jumped from 320 to 800.

AMD RV770

AMD's RV770: die hard

These numbers puzzled is so we fired off an e-mail to AMD thus:

"How the heck has the shader count climbed from 320 in RV670 to 800 in RV770 on the same 55nm process? Do the old and the new shaders use the same number of transistors?"

We got this response from Richard Huddy, AMD's head of developer relations for graphics chips: "Yes, the RV770 is only about 40 per cent larger than RV670, but the transistors are used on average about 50 per cent more efficiently too – and when you combine both of those factors together you get a much more impressive design.

"Traditionally we’ve focused only on saving Silicon area by moving to smaller processes, this time we made a very deliberate decision to get our performance per dollar much higher.’

It sounds like AMD has adopted the Intel Tick-Tock approach. RV670 - Tick - was a major step forward from the 80nm Radeon HD 2900, and RV770 - Tock - has refined the design to deliver higher performance and better value.

Combat fraud and increase customer satisfaction

More from The Register

next story
Reg man builds smart home rig, gains SUPREME CONTROL of DOMAIN – Pics
LightwaveRF and Arduino: Bright ideas for dim DIYers
Leaked pics show EMBIGGENED iPhone 6 screen
Fat-fingered fanbois rejoice over Chinternet snaps
Apple patent LOCKS drivers out of their OWN PHONES
I'm sorry Dave, I'm afraid I can't let you text that
Microsoft signs Motorola to Android patent pact – no, not THAT Motorola
The part that Google never got will play ball with Redmond
Slip your finger in this ring and unlock your backdoor, phone, etc
Take a look at this new NFC jewellery – why, what were you thinking of?
Happy 25th birthday, Game Boy!
Monochrome handset ushered in modern mobile gaming era
Rounded corners? Pah! Amazon's '3D phone has eye-tracking tech'
Now THAT'S what we call a proper new feature
US mobile firms cave on kill switch, agree to install anti-theft code
Slow and kludgy rollout will protect corporate profits
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Mainstay ROI - Does application security pay?
In this whitepaper learn how you and your enterprise might benefit from better software security.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.