Android : universal image loader out of memory

I get OOM error when the screen of more than 10 images at a time. My configs:

       DisplayImageOptions options = new DisplayImageOptions.Builder()
            .imageScaleType(ImageScaleType.EXACTLY)
            .cacheOnDisk(true)
            .bitmapConfig(Bitmap.Config.RGB_565)
            .cacheInMemory(false)
            .build();

ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
            .diskCacheSize(500 * 1024 * 1024)
            .threadPoolSize(5)
            .build();