If you have only 1GB of GPU RAM, there's no point trying.

Just a heads up, I cant get -E old all  to work on windows, the miner just crashes on start.

mine looks like this on my shortcut.  "C:\Program Files\Ethereum 0.9.41\Release\ethminer.exe" --farm-recheck 200 -G -E old -F http://192.168.1.13:8546/miner/90/asrock --cl-local-work 256 --cl-global-work 16384 -t 4   

i havent seen where you need theall  maybe i missed something.. 

Best Regards
Doug

check that you have the latest version. want to say its 1.06b2 or something like that.. the first 1.06 i think had an issue where if you used the argument and there was no dags then it crashed  try it without the -E  once it creates the new dags then try with it.. sorry i cant help you further..  https://github.com/Genoil/cpp-ethereum/tree/pick-devices/releases

Best Regards
Doug

ubuntu 14.04 cuda-7.5 and use cmake -DCOMPUTE=30 -DBUNDLE=cudaminer .. from cpp-ethereum/build
with: installed
apt-get install  build-essential fakeroot dh-make debconf execstack dh-modaliases dkms pkg-config
apt-get install libtool libncurses5-dev libcryptopp-dev libleveldb-dev libjsoncpp-dev libargtable2-dev libjson-rpc-cpp-dev
apt-get install libmicrohttpd-dev libreadline-dev libtool autotools-dev automake pkg-config  libssl-dev libevent-dev bsdmainutils
apt-get install -f libsdl2-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler libgmp-dev cpuid


[ 65%] Building NVCC (Device) object libethash-cuda/CMakeFiles/ethash-cuda.dir/ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o
cdroot/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir &&usr/bin/cmake -E make_directoryroot/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//.
cdroot/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir &&usr/bin/cmake -D verbose:BOOL=1 -D build_configuration:STRING=Release -D generated_file:STRING=/root/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//./ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o -D generated_cubin_file:STRING=/root/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//./ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o.cubin.txt -Proot/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o.cmake
-- Removingroot/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//./ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o
/usr/bin/cmake -E removeroot/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//./ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o
-- Generating dependency file:root/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o.NVCC-depend
/usr/bin/nvcc -M -D__CUDACC__root/cpp-ethereum/libethash-cuda/ethash_cuda_miner_kernel.cu -oroot/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o.NVCC-depend -ccbinusr/bin/gcc-4.8 -m64 -DETH_JSONRPC -DETH_READLINE -DETH_MINIUPNPC -DETH_ETHASHCL -DETH_ETHASHCUDA -DETH_STRATUM -DETH_CPUID -DETH_CURL -DETH_FRONTIER -DETH_TRUE -Xcompiler ,\"-std=c++11\",\"-Wall\",\"-Wno-unknown-pragmas\",\"-Wextra\",\"-Wno-error=parentheses\",\"-pedantic\",\"-DSHAREDLIB\",\"-fPIC\",\"-fuse-ld=gold\",\"-O3\",\"-DNDEBUG\",\"-DETH_RELEASE\" --std=c++11 --disable-warnings --ptxas-options=-v -use_fast_math -lineinfo -gencode arch=compute_30,code=sm_30 -O3 -DNVCC -I/usr/include -I/root/cpp-ethereum/build2/gen -I/root/cpp-ethereum/build2 -I/root/cpp-ethereum/build2/libethash-cuda -I/usr/include -I/root/cpp-ethereum/libethash-cuda/..
nvcc fatal   : Unknown option '-std'
CMake Error at ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o.cmake:206 (message):
  Error generating
 root/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir//./ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o


make[2]: *** [libethash-cuda/CMakeFiles/ethash-cuda.dir/ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o] Error 1
make[2]: Leaving directory `/root/cpp-ethereum/build2'
make[1]: *** [libethash-cuda/CMakeFiles/ethash-cuda.dir/all] Error 2
make[1]: Leaving directory `/root/cpp-ethereum/build2'
make: *** [all] Error 2

The farm check is the time interval the ethminer check for the new work. So if you decrease, the response time will be faster.

Yes I meant AMD opencl. Again if you need some testing on linux AMD rig, just drope me a line

edit this file:
/root/cpp-ethereum/build2/libethash-cuda/CMakeFiles/ethash-cuda.dir/ethash-cuda_generated_ethash_cuda_miner_kernel.cu.o.cmake

look for lines that set the nvcc_flags:
set(CUDA_NVCC_FLAGS ..........

-std isn't a valid option for some versions of mvcc - so, remove that option.
My line looks like this:
set(CUDA_NVCC_FLAGS --disable-warnings;--ptxas-options=-v;-use_fast_math;-lineinfo;-gencode;arch=compute_20,code=sm_20;-gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_50,code=sm_50 ;; )

Also, stop building as root:)
sudo is your friend, my friend.

Yeah, stop using Windows:)

Here is an example "hillbilly winders" startup bat file:

setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100

cd C:\Users\dave\Desktop\ethminer-0.9.41-genoil-1.0.5
ethminer -G -R . --farm-recheck 400 --cl-local-work 128 --cl-global-work 8192 -F http://ethereum.usa.nicehash.com:3500/n1c3-1HtkaiWKeKZ6MJgag6a3fUQo3BxcT2gAKv.nvda/20

There are a lot of things to check.

8GB of RAM is a good idea.
Make sure you have available disk space - DAG files are ~3GB in total.
Make sure your are using the latest AMD drivers - Crimson has been working well for most.
Take all that malware off your "Winders" box too - strip it BARE, or even do a clean install of a 64bit OS.