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Old 01-13-2008, 11:04 PM   #1 (permalink)
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Default 3850 512mb brands?

hey im upgrading my pc and was wondering about the 3850 512mb cards...

1)which is the best brand to go with..
-i was looking at the visiontec that had GDDR4...but i cant find the clock core and mem core of this card
Newegg.com - VisionTek 900206 Radeon HD 3850 512MB 256-bit GDDR4 PCI Express 2.0 HDCP Ready CrossFire Supported Video Card - Retail

2)whats the differences b/w GDDR3 and GDDR4?

thanks
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Old 01-13-2008, 11:11 PM   #2 (permalink)
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Default Re: 3850 512mb brands?

I think they messed up when they put GDDR4 in the specs. Notice you don't see any other 3850's with GDDR4, only 3870's

I think the real specs on it are...

GPU clock 700MHz Memory (not shader) 875MHz stream processing units 320 Powered by ATI Radeon™ HD3850 Dual Link DVI-I x2 with full resolution HDCP Support 512MB Ultra High Speed GDDR3 Memory x16 PCI Express PCI Express® 2.0 & 1.0 support Superscalar unified shader architecture ATI Avivo™ HD display enhancement technology ATI PowerPlay™ energy conserving technology DirectX® 10.1 / Shader Model 4.1 support Dual DVI-I, TV/Component HDTV Built-in HDMI Video and 5.1 audio Support for the ATI Radeon™ DVI to HDMI adapter Unified Video Decoder (UVD) for Blu-ray™ and HD-DVD All info from: VisionTek Black Box HD3850 Review - Overclockers Club

Looks like the same card
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Old 01-13-2008, 11:16 PM   #3 (permalink)
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Default Re: 3850 512mb brands?

GDDR3 vs GDDR4
1) 7.2 vs 11.2 GBps per chip max data speed
2) 1.8 vs 2.8 GBps per pin max data rate
3) 1.8 vs 1.5 v minimum power consumption which results in a 20-25% energy savings
4) 2.1 vs 1.9 v maximum power for overclocking
5) 4 vs 8 bit burst length which allows more memory bandwidth and lower latency
6) no DBI vs DBI: Data Bus Inversion - it takes more energy to transfer 0s than 1s. When there are a lot of 0s to move, it will send them as 1s instead and then use DBI to signal that all those 1s needed to be flipped back to 0s. This is a power saving feature.
7) Three point voltage control via video card driver for fine tuning and overclocking

GDDR5 is expected in 2008 and will use 1.2-1.5v.
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