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GDDR3 v's GDDR4

post #1 of 8
Thread Starter 
I have been reading a few repots on the difference between the two RAM models on the 3870's. So i now turn to overclock.net. What is the difference, if any? Has anyone had personal experience with the performance increase?

From what i have read the only difference is the OCing potential on the RAM, but is it by much?

-Smokie
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AL
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post #2 of 8
The performance difference is negligible really. GDDR4 has higher clock speeds, but also higher latencies.

The performance difference is there, but memory bandwidth just isn't the bottleneck on the 3800 series, the core speed is.

The real advantage to GDDR4 is memory density, so you can get 1GB of RAM on a GPU, but again, the 256bit bus nullifies the benefit of 1GB memory.

All in all, the 3800 series doesn't really benefit from GDDR4 that much.
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post #3 of 8
GDDR4 = faster than GDDR3 simple as that. It also consumes less power.
post #4 of 8
Thread Starter 
Ok. Its just i am looking at a sale on ebay and at the moment there is about $40 difference between a Radion GDDR3 moddel and a Gigabyte GDDR4 model.
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post #5 of 8
I'm assuming you want to crossfire with your current card? I'd say get one as close to your current card as possible. If yours has GDDR4, get a GDDR4 version. Not sure how much you're willing to spend, but there are 3 open box 3870 cards on newegg, each for 149.99 which is a damn good deal. Check em out here.
post #6 of 8
Thread Starter 
Yeah, im going to crossfire. Unfortunatley i live in australia so that deal is no good to me.
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post #7 of 8
Quote:
Originally Posted by mechtech View Post
The performance difference is negligible really. GDDR4 has higher clock speeds, but also higher latencies.

The performance difference is there, but memory bandwidth just isn't the bottleneck on the 3800 series, the core speed is.

The real advantage to GDDR4 is memory density, so you can get 1GB of RAM on a GPU, but again, the 256bit bus nullifies the benefit of 1GB memory.

All in all, the 3800 series doesn't really benefit from GDDR4 that much.
Mechtech has a very good point smokie. Rep+

Quote:
Originally Posted by TnB= Gir View Post
GDDR4 = faster than GDDR3 simple as that. It also consumes less power.
Just because GDDR4 is faster doesn't mean squat. Not at this point in GDDR4's life.
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post #8 of 8
Quote:
Originally Posted by mechtech View Post
The performance difference is negligible really. GDDR4 has higher clock speeds, but also higher latencies.

The performance difference is there, but memory bandwidth just isn't the bottleneck on the 3800 series, the core speed is.

The real advantage to GDDR4 is memory density, so you can get 1GB of RAM on a GPU, but again, the 256bit bus nullifies the benefit of 1GB memory.

All in all, the 3800 series doesn't really benefit from GDDR4 that much.

I dissagree, i have a gigabyte RAdeon 3870 with GDDR3, and i should be able to get 14K 3dmarks in '06 with my 4ghz E8400, but i cannot because of a huge limit in memory bandwidth due to limits in clock speeds. even with a 958mhz core clock on my card. GDDR4 is pulling clocks of 2.6ghz+ whereas i can only acheive a meisly 2.2ghz~ at max. ive been comparing with a system i built for a friend that is very close, cpu is a bit slower (3.6ghz) and so is the core on the radeon, but my card (958/2088) vs. his card (850/2400) is still right up there with my system, nearly neck and neck.
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