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+-- Forum: ROCK64 (https://forum.pine64.org/forumdisplay.php?fid=85)
+--- Forum: General Discussion on ROCK64 (https://forum.pine64.org/forumdisplay.php?fid=86)
+--- Thread: DRAM and GPU clock (/showthread.php?tid=4746)
DRAM and GPU clock - stephen fleming - 07-11-2017
I have seen conflicting information about the speed for the DRAM. The forum lists the speed as 1866MHz (actual clock of 933MHz), while the Pine store lists the speed as 1600MHz (actual clock of 800MHz). So which is it? Also what is the clock frequency of the GPU?
RE: DRAM and GPU clock - MarkHaysHarris777 - 07-11-2017
(07-11-2017, 06:08 PM)stephen fleming Wrote: I have seen conflicting information about the speed for the DRAM. The forum lists the speed as 1866MHz (actual clock of 933MHz), while the Pine store lists the speed as 1600MHz (actual clock of 800MHz). So which is it? Also what is the clock frequency of the GPU?
PC-1600 actually something less than 800
The problem is that the PC-1866 LPDDR3 is not stable (marketing) in terms of availability and price; so they decided to go with the stable available memory;
RE: DRAM and GPU clock - xalius - 07-11-2017
Prototype boards and development samples had LPDDR3-1866, but since the price difference is almost 10$ compared to -1600, the production models have LPDDR3-1600, that speed bin is also more easy to source on the market. As for ARM Mali clock speeds, the current operating point table enables 200-600MHz.
https://github.com/ayufan-rock64/linux-kernel/blob/release-4.4/arch/arm64/boot/dts/rockchip/rk3328.dtsi#L609
RE: DRAM and GPU clock - stephen fleming - 07-11-2017
The places that I saw that the memory was 1866MHz is in a CNXSoft article announcing the Rock64 a month ago, and the banner for the Rock64 forum:
ROCK64 is a credit card size 4K60P HDR Media Board Computer powered by Rockchip RK3328 Quad-Core ARM Cortex A53 64-Bit Processor and support up to 4GB 1866MHz LPDDR3 memory
The reason why I am interested in specifically what the DRAM and GPU clock, is that I am making a spreadsheet with the specs for the Rock64, Raspberry Pi 3 and Odroid C2. Also one thing that I noticed in the CNXSoft article is that the 40 pin pi-2 connector had analog inputs, but there was no indication on the pin-out documentation for the connector of any pins associated with a ADC that I could see.
RE: DRAM and GPU clock - MarkHaysHarris777 - 07-11-2017
(07-11-2017, 07:54 PM)stephen fleming Wrote: The places that I saw that the memory was 1866MHz is in a CNXSoft article announcing the Rock64 a month ago, and the banner for the Rock64 forum:
ROCK64 is a credit card size 4K60P HDR Media Board Computer powered by Rockchip RK3328 Quad-Core ARM Cortex A53 64-Bit Processor and support up to 4GB 1866MHz LPDDR3 memory
The reason why I am interested in specifically what the DRAM and GPU clock, is that I am making a spreadsheet with the specs for the Rock64, Raspberry Pi 3 and Odroid C2. Also one thing that I noticed in the CNXSoft article is that the 40 pin pi-2 connector had analog inputs, but there was no indication on the pin-out documentation for the connector of any pins associated with a ADC that I could see.
We've explained the memory situation to you, and we told you the truth. Eventually the PC-1866 memory will be used after it stabilizes. The article is not wrong either -- up to 1866 is allowed; just ours doesn't have it !!
You can read about the pinouts of the PI-2 and PI P5+ bus at this link. The gpio(s) are not analogue; however, I2C and SPI are supported so adding any number of ADC-DAC chips is possible;
RE: DRAM and GPU clock - stephen fleming - 07-11-2017
Ok, so DDR3-1600 will be used now, then DDR3-1866 later. Got it.