We just got information that the new RD790, RD780 & RX780 chipsets will have a new option in BIOS that will allow to get a few extra performance. This is something like NVIDIA's LinkBoost feature but goes a step further in tweaking.
Feature Options: ON (default) / OFF / Custom
Upon selecting CUSTOM option - 3 options that have no submenus appear (the details listed below are hidden). These options only have two modes ON or OFF. Selecting ON selects ALL functions in that mode.
* o CPU (ON default /OFF)
* o XpressRoute (ON default/OFF)
* o MemBoost (ON default/OFF)
Sub Section Name: CPU (ON / OFF)
* Function 1: To Maximize CPU performance
* Detail: Change CPU ClkDivisor to ?Divide-by-1? mode
* Limitation: For Phenom (K10) CPU only
Sub Section Name: XpressRoute (ON / OFF)
* Function 1: To accelerate transfers of data to and from graphics
* Detail: Increase PCIE clock for Graphic cards with certain device ids. Internal qualification has been done on R600 and R580+ cards and has shown stability at 150Mhz-160Mhz on the PCIE bus (Gen1). Corner lot testing has shown that 125Mhz should be the recommended default to cover worst case scenarios.
* Limitation: For RD780 and RD790 only.
* Function 2: To accelerate transfers of data b/w graphics (most notably in SW CrossFire)
* Detail: Enable BIOS setting to allow P2P transfers
* Limitation: For RD780 and RD790 only
* Function 3: To maximize transfer bandwidth of graphics data with a HT1 CPU
* Detail: Enable BIOS setting to double pump graphics data across HyperTransport
* Limitation: For RD780 and RD790 only. For HT1 CPUs only (disable for HT3 CPUs)
Sub Section Name: MemBoost (ON / OFF)
* Function 1: To accelerate memory bandwidth performance with DDR2-800 or higher DIMMs with K8 CPUs
* Detail: Alter memory timings for DDR2-800 or higher DIMMs
* Limitation: For RD780 and RD790 only. For DDR2-800 or higher DIMMS. For K8 CPUs only.
Fine tuning adjustments:
Trc, reduce by 2
Twr, reduce by 2
Trrd, reduce by 1
Tref, 7.8us instead of 3.9us
Twtr, reduce by 1
BankSwizzleMode, Enable
Queue Bypass Max. increase to 7
* Function 2: Disable DRAM PowerDown mode
* Detail: Change register to 0
* Limitation: For RD780 and RD790 only.
* Function 3: Read Enthusiast DIMMs with multiple SPDs
* Detail: Read Performance SPD that gives maximum performance
* Limitation: For RD790 only.
Stay tuned as i will have test to show performance gains
Source: http://www.chilehardware.com/f...?p=1380609#post1380609
Feature Options: ON (default) / OFF / Custom
Upon selecting CUSTOM option - 3 options that have no submenus appear (the details listed below are hidden). These options only have two modes ON or OFF. Selecting ON selects ALL functions in that mode.
* o CPU (ON default /OFF)
* o XpressRoute (ON default/OFF)
* o MemBoost (ON default/OFF)
Sub Section Name: CPU (ON / OFF)
* Function 1: To Maximize CPU performance
* Detail: Change CPU ClkDivisor to ?Divide-by-1? mode
* Limitation: For Phenom (K10) CPU only
Sub Section Name: XpressRoute (ON / OFF)
* Function 1: To accelerate transfers of data to and from graphics
* Detail: Increase PCIE clock for Graphic cards with certain device ids. Internal qualification has been done on R600 and R580+ cards and has shown stability at 150Mhz-160Mhz on the PCIE bus (Gen1). Corner lot testing has shown that 125Mhz should be the recommended default to cover worst case scenarios.
* Limitation: For RD780 and RD790 only.
* Function 2: To accelerate transfers of data b/w graphics (most notably in SW CrossFire)
* Detail: Enable BIOS setting to allow P2P transfers
* Limitation: For RD780 and RD790 only
* Function 3: To maximize transfer bandwidth of graphics data with a HT1 CPU
* Detail: Enable BIOS setting to double pump graphics data across HyperTransport
* Limitation: For RD780 and RD790 only. For HT1 CPUs only (disable for HT3 CPUs)
Sub Section Name: MemBoost (ON / OFF)
* Function 1: To accelerate memory bandwidth performance with DDR2-800 or higher DIMMs with K8 CPUs
* Detail: Alter memory timings for DDR2-800 or higher DIMMs
* Limitation: For RD780 and RD790 only. For DDR2-800 or higher DIMMS. For K8 CPUs only.
Fine tuning adjustments:
Trc, reduce by 2
Twr, reduce by 2
Trrd, reduce by 1
Tref, 7.8us instead of 3.9us
Twtr, reduce by 1
BankSwizzleMode, Enable
Queue Bypass Max. increase to 7
* Function 2: Disable DRAM PowerDown mode
* Detail: Change register to 0
* Limitation: For RD780 and RD790 only.
* Function 3: Read Enthusiast DIMMs with multiple SPDs
* Detail: Read Performance SPD that gives maximum performance
* Limitation: For RD790 only.
Stay tuned as i will have test to show performance gains
Source: http://www.chilehardware.com/f...?p=1380609#post1380609
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