Cgminer works well with sha256, but with scrypt does not.
It shows 850 kH (it's too much, right?), with no sound/submitted shares for 3 hours.
Is problem in config or in driver?
(...)
I have a Radeon Hd4870 512MB+ Catalyst 11.12 + Win XP (1.5G RAM)
It mines bitcoins with 100 MH @ 840 MHZ. What kind of HW error could it be?
Try this config for starters. Then look here to fine tune: https://en.bitcoin.it/wiki/Mining_hardware_comparison
"intensity" : "13",
"vectors" : "2",
"worksize" : "128",
"lookup-gap" : "2",
"thread-concurrency" : "4000",
"shaders" : "800",
"gpu-engine" : "750",
"gpu-fan" : "25-100",
"gpu-memclock" : "900",
"auto-fan" : true,
"gpu-vddc" : "0.000",
"temp-cutoff" : "95",
"temp-overheat" : "90",
"temp-target" : "80",
"api-port" : "4028",
"gpu-threads" : "1",
"hotplug" : "0",
"log" : "5",
"temp-hysteresis" : "6",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
[2013-09-02 17:07:58] Started cgminer 3.4.0
[2013-09-02 17:07:58] Loaded configuration file cgminer.conf
[2013-09-02 17:07:58] CL Platform 0 vendor: Advanced Micro Devices, Inc.
[2013-09-02 17:07:58] CL Platform 0 name: AMD Accelerated Parallel Processing
[2013-09-02 17:07:58] CL Platform 0 version: OpenCL 1.1 AMD-APP (831.4)
[2013-09-02 17:07:58] Platform 0 devices: 1
[2013-09-02 17:07:58] 0 ATI RV770
[2013-09-02 17:07:59] GPU 0 iAdapterIndex 0 strUDID PCI_VEN_1002&DEV_9440&SUBSY
S_E131174B&REV_00_4&178951BB&0&0008A iBusNumber 3 iDeviceNumber 0 iFunctionNumbe
r 0 iVendorID 1002 strAdapterName ATI Radeon HD 4800 Series
[2013-09-02 17:07:59] GPU 0 ATI Radeon HD 4800 Series hardware monitoring enabl
ed
[2013-09-02 17:07:59] Setting GPU 0 engine clock to 750
[2013-09-02 17:07:59] Setting GPU 0 memory clock to 900
[2013-09-02 17:07:59] GPU 0 call to fanspeed get failed
[2013-09-02 17:07:59] Popping work to stage thread
[2013-09-02 17:07:59] Probing for an alive pool
[2013-09-02 17:07:59] Testing pool stratum+tcp://127.0.0.1:3333
[2013-09-02 17:07:59] Pool 0 stratum session id: ae6812eb4cd7735a302a8a9dd95cf7
1f
[2013-09-02 17:07:59] Pool 0 difficulty changed to 32
[2013-09-02 17:07:59] Stratum authorisation success for pool 0
[2013-09-02 17:07:59] Pool 0 stratum+tcp://127.0.0.1:3333 alive
[2013-09-02 17:08:00] Init GPU thread 0 GPU 0 virtual GPU 0
[2013-09-02 17:08:00] CL Platform vendor: Advanced Micro Devices, Inc.
[2013-09-02 17:08:00] CL Platform name: AMD Accelerated Parallel Processing
[2013-09-02 17:08:00] CL Platform version: OpenCL 1.1 AMD-APP (831.4)
[2013-09-02 17:08:00] List of devices:
[2013-09-02 17:08:00] 0 ATI RV770
[2013-09-02 17:08:00] Selected 0: ATI RV770
[2013-09-02 17:08:00] Preferred vector width reported 4
[2013-09-02 17:08:00] Max work group size reported 256
[2013-09-02 17:08:00] Max mem alloc size is 134217728
[2013-09-02 17:08:00] Selecting scrypt kernel
[2013-09-02 17:08:00] No binary found, generating from source
[2013-09-02 17:08:00] Setting worksize to 128
[2013-09-02 17:08:00] cl_amd_media_ops not found, will not set BITALIGN
[2013-09-02 17:08:00] BFI_INT patch requiring device not found, will not BFI_IN
T patch
[2013-09-02 17:08:00] CompilerOptions: -D LOOKUP_GAP=2 -D CONCURRENT_THREADS=40
00 -D WORKSIZE=128 -D GOFFSET -D OCL1