WARNING !!!
You are at risk of bricking your device should you choose to use the attached firmware & tools. You have been warned. You agree that any liability arising from the usage and/or sharing of the files below is strictly yours and may not be transferred to anyone else in this forum. Use at your own risk !!!



This is a pure stock of v1.0.9 with an overclocked kernel. All other functionality is identical to original v1.0.9. Even broken root exists, which means you need to fix root upon installing firmware just like official v1.0.9.



Changes:

- Overclocked CPU speed from 1,608 Mhz to 1,800 Mhz.

- Overclocked GPU speed from 600 Mhz to 798 Mhz.

- Overclocked DDR2 Bus Speed from 400 Mhz to 677 Mhz.

Result:

- Amazing performance & processing speeds for both applications & games :-) I'm not easily impressed :-P

Side Effects:

- Massive drain in power, battery would probably last for 2 hours after a full charge.

- Gradual heat up of unit as processor runs at overclocked speeds.

S7800B Firmware v1.0.9_CPU1800mhz_GPU798mhz_DDR2BUS677mhz.zip (346.05 MB)

http://www.multiupload.nl/NHT3QE2FKT
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Alpha v0.2 Changes

- Reverted DDR2 Bus Speed back to 400 Mhz.

- Fixed voltage irregularities that caused hardware instability & battery drain.

Was able to run PPSSPP - God of War (Ghost of Sparta) @ full frame :-) and no system hangs. Would really appreciate your feedback to determine if this is the optimal combination for the s7800B.

S7800B Firmware v1.0.9_CPU1800mhz_GPU798mhz_DDR2BUS400mhz_v0.2.zip (346.05 MB)

http://www.multiupload.nl/YCPUSOOYNN
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Alpha v0.3 Changes

- Reduced maximum speed from 1,800 Mhz to 1,704 Mhz to enhance to stability. 1,800 Mhz worked well for a short period of time until the processor heated up then throttled the speed down which caused massive lags.

- Reduced GPU speed from 798 Mhz to 600 Mhz. Again due to accelerated heating, system hangs and graphic glitches were common. Tested with Asphalt 8, immediate failure. Reduced to 600 Mhz, now runs perfectly and also enables high quality setting on Asphalt 8 as well.

- Reduced DDR2 bus speed from 677 Mhz to 400 Mhz, again to enhance stability. At 677 Mhz, system was extremely unstable, severe graphic glitches, unstable ram, loss of data, dangerous heating levels, and frequent system resets.

Speed is much better and unit is way more responsive. Awaiting your valuable feedback :-)

S7800B Firmware v1.0.9_CPU1704mhz_GPU600mhz_DDR2BUS400mhz_v0.3.zip (346.05 MB)

http://www.multiupload.nl/1FF1VSULI8
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Alpha v0.4 Changes

- Successfully modified voltage tables to stabilize performance at 1,800Mhz :-D

- Battery will drain much faster to ensure stability of CPU.

I was very pleased with the results obtained.
Asphalt 8 + High Quality Graphics Settings + Forced 4x MSAA from "Developer Options" in Settings = Liquid smooth graphics.
Best of all no freezes or glitches ;-)

Attached is an Antutu benchmark score measured with the overclocked Rom putting the s7800B above the Samsung Galaxy Note 2 in terms of performance.



S7800B Firmware v1.0.9_CPU1800mhz_v0.4_Stable.zip (346.05 MB) STABLE

http://www.multiupload.nl/LRA5BE8UAU
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Alpha v0.5 Changes

- Updated Mali drivers.
- Fixed Mali clock & voltage values/tables.
- GPU clocked at 600 Mhz with all 4 cores active as initial default clock.
- Fixed init.rc values
- Updated boot.img with all necessary fixes.

Take a look at Antutu X's benchmark results and the amazing graphics quality of Asphalt 8 on Alpha v.0.5






S7800B Firmware v1.0.9_CPU1800mhz_Alpha_v0.5_Stable.zip (346.05 MB) STABLE

http://www.multiupload.nl/4D5W9YE5SR

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Installation:

- Included RKbatchTool v1.7 with English Language Support.
- Included all necessary drivers.
- Simply follow the exact same steps to upgrade to JXD's Official Firmware to apply this firmware.
- You will need to Re-root upon after flashing firmware.
- Install SetCPU or MasterCPU to modify speeds.

This release is intended for testing purposes and is not an official release. It is still in alpha. If for whatever reason, the image fails on your device, just flash the original JXD firmware v1.0.9 to restore capped speeds and normal operation.

ALWAYS MAKE SURE YOUR DEVICE IS FULLY CHARGED BEFORE YOU FLASH ANY FIRMWARE IMAGES


source : http://boards.dingoonity.org/jxd-devices/s7800b-fw-v1-0-9-cpu-1800mhz-gpu-798mhz-ddr2bus-677mhz-alpha-!!!/