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AMD introduces ATI Radeon HD 4830 graphics card

AMD introduces ATI Radeon HD 4830 graphics card

AMD has introduced the ATI Radeon HD 4830 and says it raises the gaming performance bar for sub-£100 graphics cards. Sadly, the reference card we received has a shady shader count...

AMD today introduced the ATI Radeon HD 4830, billing it as a product that raises the gaming performance bar for sub-£100 graphics cards.

It's based on a cut-down version of the excellent RV770 GPU that is behind the rest of the Radeon HD 4800 series, featuring 640 stream processors (128 five-way superscalar shader units), 32 texture units, 16 ROPs and a 256-bit memory interface.

The GPU, which is known as the RV770LE, is clocked at 575MHz while the 512MB of GDDR3 memory runs at 1,800MHz (effective). This should deliver some excellent performance at under £100.

We've been feverishly testing the card for a few days now, but we've had a few issues - the biggest so far was some rather strange performance with the reference card we received from AMD. The characteristics just didn't add up against the Radeon HD 4850 - it was too slow and that understandably prompted a lot of head scratching.

We went away and started running benchmarks to calculate the card's theoretical throughputs and then we came across some more anomalies when we installed a Radeon HD 4830 we'd received from HIS. The two cards had the same clock speeds but not only showed different performance characteristics in Crysis, but also showed completely different theoretical throughputs.

And then we came across this article earlier this morning.

Sure enough, we fired up the latest build of GPU-Z and the evidence was right there in front of us. The Radeon HD 4830 we'd received from AMD had three of its ten SIMD cores disabled, meaning only 560 stream processors (112 shader units) were actually enabled. No wonder our performance results looked a little strange.

We contacted AMD and a representative said the company was aware of the problem, but it didn't have an official comment on the issue just yet - we'll bring you more as and when we get more information. What we're hoping is that this is limited to the reference cards sent out to AMD, but it's also quite possible that this might break out into the channel if partners have shipped an AMD-built card with a custom sticker.

Stay tuned for our Radeon HD 4830 review early next week and, in the meantime, you can discuss this news in the forums.

8 Comments

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badders 23rd October 2008, 20:29 Quote
So.... You got an unintentional Radeon 4810 then?
mclean007 23rd October 2008, 21:11 Quote
Quote:
The Radeon HD 4830 we'd received from AMD had seven of its ten SIMD cores disabled, meaning only 560 stream processors (112 shader units) were actually enabled.
Do you mean only seven were enabled i.e. 3 were disabled, as opposed to 8 being enabled and 2 disabled as should be the case, giving the proper SP cound of 8*5*16 = 640 compared to 10*5*16 = 800 on the full fat 4850 and 4870?
Tim S 23rd October 2008, 21:38 Quote
Quote:
Originally Posted by mclean007
Do you mean only seven were enabled i.e. 3 were disabled, as opposed to 8 being enabled and 2 disabled as should be the case, giving the proper SP cound of 8*5*16 = 640 compared to 10*5*16 = 800 on the full fat 4850 and 4870?

Thanks, you're right - brain fart. :)
Cupboard 24th October 2008, 00:16 Quote
oops. Rather an odd thing to happen unless they are, as Badders suggests, releasing something else based on the RV770
ZseLotH 24th October 2008, 02:15 Quote
Might be my next buy when I see full benchmarks and get money... GJ ATI/AMD
docodine 24th October 2008, 04:18 Quote
Not worth the price, at $20 less than the cheapest 4850.

If it goes under $100, maybe.
xaser04 24th October 2008, 09:53 Quote
I saw this on the techpowerup review as well. It is odd although one saving grace at least from the TPU review is the fact that the 560stream card overclocks like it has a hundred weight of wusabi (sp?!) up its backside.

On another note OCUK and ebuyer have these up for preorder for £99.99 which quite frankly is an absolute rip off. It is only £10 cheaper than the HD4850 (and if you look around it isn't cheaper at all). Why you would choose one of these (at the current pricing) over a HD4850 (or even a 9800GTX+ which I have seen for £99 as well) is beyond me.
DXR_13KE 24th October 2008, 13:58 Quote
i think they fixed it already...

"How to Fix
Added: Oct 24, 2008

Grab this BIOS from our VGA BIOS Collection and flash it to the card using WinFlash or ATIFlash.

This BIOS is designed for the AMD reference design samples that were sent out with 560 shaders, there is no reason to flash it on cards from other manufacturers that already have 640 shaders. "
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