don't think you're paying attention mate. gddr5 is cheaper to implement because it uses a less complicated process. and right now the chips are on 10% more expensive than a lower speed gdd3 counterpart. the 512bit bus on the gt200 has made the chip huge and expensive to produce. there's more than chip cost involved in the price of memory. check out the gddr5 thread for more info. gddr5 is MUCH cheaper to implement. so no it is not at all more expensive.
1- GDDR5 uses a
smaller process. smaller != simpler != cheaper. For comparison 55nm process in the HD3000 series was not a lot cheaper (if ay all at launch time) than 65 nm in the time. We can say the same about firts 45 nm Intels. Check your facts.
2- Right now slow GDDR5 is 10-20% more expensive than
higher speed GDDR3 (0.8 ns). Slower GDDR3 such as 1ns memory is way cheaper. GTX260, the only possible "direct" competitor to Ati, uses the cheaper one and has more or less the same bandwidth as the 770XT. GTX 280 has a significant higher bandwidth, so we are not comparing apples to apples there. We could easily say that we are comparing extreme high GDDR3 vs. slow GDDR5 and the actual result is Nvidia has the higher bandwidth, so Ati solution being cheaper makes sense, it's what we should expect from the slower part. 512 bit + GDDR3 here is giving more bandwidth, it's overkill, unnecerary IMO, but faster still.
3- I didn't talk about the implementation, but the price of memory. If you read his post you would notice he
first says GDDR5 is cheaper and
then starts talking about the implementation like this: cheaper GDDR5 + cheaper controler, PCB, etc = WIN WIN. That's what I understand in his statement. And that's not true NOW, it will in 3-6 months probably. And that's what I stated. And it's in this same moment, having to justify my statements, when newtekie's post #20 makes even more sense to me...
Well someone needs to tread in the deep end other wise no one will ever get in the pool
Indeed! Who said the oposite? I only made clear that GDDR5 is not cheaper NOW. I didn't say it was a bad decision or anything. I just say that price wise NOW may not be better, not by much at least. In reality we don't know if it's cheaper at all:
1- Memory is more expensive and in short supply NOW*. So much that Ati halved the frame buffer to 512 MB in the 770XT and uses GDDR3 in the Pro. Never forget this, as it pictures the truth in a "check the reality" fashion.
2- We have no real proofs that making a 256 bit GDDR5 controler is cheaper than 512/448 bit GDDR3 controler RIGHT NOW* and get the same performance. Remember DDR vs DDR2, DDR2 vs DDR3, GDDR3 vs GDDR4...
3- PCB is a lot cheaper, but IMO it's the only part where there's an econ0mic benefit RIGHT NOW* and it doesn't account all that much to the retail price..
*Sorry because I used it so much, but I think that I have to make clear that I am talking about today. Otherwise some people will think I'm saying something that I am not. I have no doubts it will be better with the time. That's why I said 3-6 months.