ATI Mobility Radeon HD 4860 and 4830 appear on 40nm

Tuesday 03rd March 2009, 10:00:00 AM, written by Rys

Spotted over at The Tech Report, the Graphics Products Group at AMD have taken wraps off the ATI Mobility Radeon HD 4860 and HD 4830, and thus RV740.

HD 4860 is a step up from the existing HD 4850, by virtue of support for GDDR5 and thus relative gobs of memory bandwidth (despite having 128-bit to DRAM, rather than the 256-bit of Mobility HD 4850).  8 RV770-class SIMDs make for 640 SPs, and the unified GPU frequency has a peak of 650 MHz, depending on the thermal solution of the laptop it'll find itself in.

4830 is likely a GDDR3-only configuration, with the memory bandwidth and clock rates placing it in the performance pile below Mobility Radeon HD 4850.

Notably, TSMC manufacture the new silicon at 40nm, making it the first 40nm mobile GPU in mass production.

Update:

AMD got in touch to let us know that because no notebooks are shipping with HD 4860 yet, they've created some video content that shows it off, using MXM modules inside regular chassis'.  AMD's Rick Bergman has also written a blog entry talking about the new chip, and there's also some shiny new image media as well.

Discuss on the forums

Tagging

ati ± mobility, rv740, radeon, gddr5, 640


Latest Thread Comments (37 total)
Posted by mczak on Thursday, 05-Mar-09 00:51:31 UTC
Quoting neliz
I think you're right

Maybe it's 430 for the GPU's using the shared memory and 650 for the cards on an MXM module.
mobility 4830 never use shared memory. But still the 128bit ddr3 (likely) will limit it (similar core clock to 4860 but half the memory bandwidth).

Posted by neliz on Thursday, 05-Mar-09 00:58:09 UTC
Quoting mczak
mobility 4830 never use shared memory. But still the 128bit ddr3 (likely) will limit it (similar core clock to 4860 but half the memory bandwidth).
Yes they do!

http://ati.amd.com/products/mobilityradeonhd4800/4860_index.html

check the 4860 says gddr5, the 4830 says gddr3/ddr3 (900 and 800mhz.) I'm pretty sure the inq said:

Quote
Memory-wise, the cheaper part, the 4830, will support a shared-memory architecture or dedicated VRAM, depending on the notebook model. The 4860 will have GDDR5 from Qimonda (yes, still churning out the memory).
The only problem is that DDR3 is not mentioned in the official press release since they only talk about GDDR3/5. that's why it doesn't get mentioned on most sites.

Posted by Kaotik on Thursday, 05-Mar-09 01:04:09 UTC
Quoting mczak
mobility 4830 never use shared memory. But still the 128bit ddr3 (likely) will limit it (similar core clock to 4860 but half the memory bandwidth).
Of course it IS the inq, but they claim 4830 does:
http://www.theinquirer.net/inquirer/news/229/1051229/ati-40nm-gpus-arrive

Posted by mczak on Thursday, 05-Mar-09 02:13:42 UTC
Quoting neliz
Yes they do!
Not really bashing the inq, but seriously that doesn't make any sense whatsover. Being non-igp chip it would need to access all memory through pcie. I don't think that's even theoretically possible (need some latency guarantees for display scanout), and even if it is that still makes no sense - even those poor 40 alu igps are quite memory bandwidth limited!

Posted by Lukfi on Thursday, 05-Mar-09 05:23:15 UTC
What's the big deal? About every GPU on the market today supports some kind of "TurboCache" / "HyperMemory" thingy, the mobile HD 4830 not being an exception. Of course if you put enough dedicated memory on the card (that would be the GDDR3/DDR3), you don't need the shared one (although the option is always there should you run out of graphic memory).

Posted by Tchock on Thursday, 05-Mar-09 08:44:51 UTC
No the Mob 4830 does not use hypermemory.It uses either specialized GDDR3 (higher clockspeed, excess inventory), or commercial RAM-like DDR3 (cheaper) modules, just like the desktop 4670 does.

Posted by neliz on Thursday, 05-Mar-09 09:06:02 UTC
So is it a CCC bug that the Dark Knight 4870's all have hypermemory enabled?

Posted by Tchock on Thursday, 05-Mar-09 11:52:26 UTC
Quoting neliz
So is it a CCC bug that the Dark Knight 4870's all have hypermemory enabled?
More likely BIOS, though.What if it was intentional?AFAIK anything over _6__ in ATI's DX10+ series does not use HM.

Posted by Kaotik on Thursday, 05-Mar-09 14:19:50 UTC
Quoting Tchock
More likely BIOS, though.
What if it was intentional?


AFAIK anything over _6__ in ATI's DX10+ series does not use HM.
My DXDiag wants to disagree with you, showing Approx total mem. for my HD3850 512MB at 2298MB, due the fact that it CAN use my main RAM too if needed.

Posted by Tchock on Thursday, 05-Mar-09 15:46:55 UTC
Quoting Kaotik
My DXDiag wants to disagree with you, showing Approx total mem. for my HD3850 512MB at 2298MB, due the fact that it CAN use my main RAM too if needed.
WDDM management. Happens on my 2900XT, and obviously nVidia cards too. :wink:

This is different from the "hypermemory" indication found in ATI's CCC, which shows the local (or non-OS-managed-shared?) memory of the GPU.


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